凤凰彩票入口,皇冠新现金网手机app

共找到 14 個相關產品馬可波羅 > 電熱管> 精密單頭電熱管

類目：

電熱管 (13)
離子風機 (1)

品質商家熱力排行

全國

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="62" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100582682953.html">品質保證 精密單頭電熱管 非標定制
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100582682953.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>興泰</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>xt</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>單頭電熱管</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>300w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城市華邦合金電器有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱管,電熱圈
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://xtdq888.cn.makepolo.com/contact_us.html?proid=100582682953">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>20</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100582682953.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100582682953.html" target="_blank" data-num="7" data-flag="0" title="品質保證 精密單頭電熱管 非標定制"><img src="http://img12.makepolo.cn/images/formals/img/product/958/429/4_bf3eb945d856d3d1557438b339f54102.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="品質保證 精密單頭電熱管 非標定制"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="61" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100061339512.html">精密單頭電熱管
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100061339512.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌/型號：</div></td>
<td class="td_2"><div>新宏大/DT-14</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>700（W）w</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>主要用途：</div></td>
<td class="td_2"><div>平板硫化機，制鞋機，熱熔點膠機，卷煙設備</div></td>


</tr>
<tr>
<td class="td_1"><div>工作電壓：</div></td>
<td class="td_2"><div>220（V）</div></td>
<td class="td_1"><div>產品認證：</div></td>
<td class="td_2"><div>CE</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
<a  data-num="3"  data-flag="0" target="_blank">
深圳市新宏大電熱科技有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
熱電偶,電熱絲,熔化爐,電熱管,電熱板
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://xinhongda168.cn.makepolo.com/contact_us.html?proid=100061339512">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>50</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100061339512.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100061339512.html" target="_blank" data-num="7" data-flag="0" title="精密單頭電熱管"><img src="http://img2.makepolo.cn/images/formals/img/product/20/72/bb94f660244cecc42ac5001a5fd1c790.jpg~tplv-1fgsepqywg-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="精密單頭電熱管"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="55" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100636398244.html">大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管優(yōu)質廠家
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100636398244.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>


</tr>
<tr>


</tr>
<tr>


</tr>

</table>
</a>

<div   id="gn8cdul5"   class="s_product_intro plistk">
<a href="http://www.fhjczf.com/product-detail/100636398244.html" target="_blank" data-num="9"  data-flag="0">´---------------------------------------------------------------------------------------------------------</a><nobr>[<a href="http://www.fhjczf.com/product-detail/100636398244.html" target="_blank" data-num="2"  data-flag="0" class="s_product_intro_more">查看詳情</a>]</nobr>
</div>

</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
<a  data-num="3"  data-flag="0" target="_blank">
東莞千度電熱器材有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
溫度計,熱電偶,溫濕度控制器,塑料模,電熱管
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://hotmodo.cn.makepolo.com/contact_us.html?proid=100636398244">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>150.00</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100636398244.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100636398244.html" target="_blank" data-num="7" data-flag="0" title="大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管優(yōu)質廠家"><img src="http://img10.makepolo.cn/images/formals/img/product/483/822/3_bd63f566e4711f54ab584996a4e6e3b1.jpg~tplv-2ri1qt4xxh-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管優(yōu)質廠家"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="51" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100859839451.html">大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管  華邦廠家供應
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100859839451.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>其他</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>XT-DT</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>單頭電熱管</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>3000w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城華邦合金電器有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱管
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://jiangsuxingtai1.cn.makepolo.com/contact_us.html?proid=100859839451">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>20</strong>元/根</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100859839451.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100859839451.html" target="_blank" data-num="7" data-flag="0" title="大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管  華邦廠家供應"><img src="http://img12.makepolo.cn/images/formals/img/product/355/129/4_b5138939edca15fcdb5f1b9cea6fea9c.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="大量批發(fā) 承接加熱棒 精密加熱棒 單頭電熱管  華邦廠家供應"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="30" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100630320785.html">常熟單頭電熱管品牌 單頭電熱管價格
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100630320785.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>常熟市海虞精密電熱元件廠</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>詳見說明</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>詳見說明</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>詳見說明</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>詳見說明w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇蘇州] <a  data-num="3"  data-flag="0" target="_blank">
常熟市海虞精密電熱元件廠
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
加熱器,電熱圈,電熱管,電熱片/發(fā)熱片
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://csjmdryj.cn.makepolo.com/contact_us.html?proid=100630320785">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>1</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100630320785.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100630320785.html" target="_blank" data-num="7" data-flag="0" title="常熟單頭電熱管品牌 單頭電熱管價格"><img src="http://img11.makepolo.cn/images/formals/img/product/286/856/4_6e7e68e8d1251afe21000c9cec317494.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="常熟單頭電熱管品牌 單頭電熱管價格"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="28" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100310573429.html">加熱器 單頭管 精密加熱管
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100310573429.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌/型號：</div></td>
<td class="td_2"><div>MS/11</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>11</div></td>


</tr>
<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>MS</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>26（W）w</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>管徑：</div></td>
<td class="td_2"><div>5.3（mm）</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[浙江溫州] <a  data-num="3"  data-flag="0" target="_blank">
樂清市名升五金制品有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱管,熔化爐,其他通用五金配件,溫度計,插
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://mswj2011.cn.makepolo.com/contact_us.html?proid=100310573429">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>1.00</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100310573429.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100310573429.html" target="_blank" data-num="7" data-flag="0" title="加熱器 單頭管 精密加熱管"><img src="http://img1.makepolo.cn/images/formals/img/product/250/525/56ea408d911dbd3cd809eef58aa6c15b.jpg~tplv-1fgsepqywg-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="加熱器 單頭管 精密加熱管"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="23" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100044837979.html">SMT車間消靜電設備 單頭離子風機
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100044837979.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌/型號：</div></td>
<td class="td_2"><div>SL-D/SL-001</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>SL-001</div></td>


</tr>
<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>SL-D</div></td>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>臺式離子風機</div></td>


</tr>
<tr>
<td class="td_1"><div>氣流方向：</div></td>
<td class="td_2"><div>橫流風機</div></td>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼風機</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[廣東深圳] <a  data-num="3"  data-flag="0" target="_blank">
深圳市百金齊電子技術有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電阻爐/馬弗爐/電爐,貼片機,防靜電服及配件
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://trend1020.cn.makepolo.com/contact_us.html?proid=100044837979">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>465.00</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100044837979.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100044837979.html" target="_blank" data-num="7" data-flag="0" title="SMT車間消靜電設備 單頭離子風機"><img src="http://img5.makepolo.cn/images/formals/img/product/931/812/9813708cc1b1f0fecba4c5008910afe8.jpg~tplv-izbs7asbod-1:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="SMT車間消靜電設備 單頭離子風機"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="8" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100580986000.html">精密單頭加熱管電熱管 電熱設備
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100580986000.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>興泰</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>xt</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>單頭電熱管</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>800w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城市華邦合金電器有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱管,電熱圈
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://xtdq888.cn.makepolo.com/contact_us.html?proid=100580986000">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>15</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100580986000.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100580986000.html" target="_blank" data-num="7" data-flag="0" title="精密單頭加熱管電熱管 電熱設備"><img src="http://img12.makepolo.cn/images/formals/img/product/179/906/4_376351aacf3f38b1398bbef25b97526f.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="精密單頭加熱管電熱管 電熱設備"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="7" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100330892726.html">自動點膠機、精密滴膠機不銹鋼單頭、單端電發(fā)熱管
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100330892726.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌/型號：</div></td>
<td class="td_2"><div>ＸＢ/HHD-02</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>HHD-02</div></td>


</tr>
<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>ＸＢ</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>150W（W）w</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>主要用途：</div></td>
<td class="td_2"><div>自動點膠機、精密滴膠機</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[廣東東莞] <a  data-num="3"  data-flag="0" target="_blank">
東莞市顯博電熱電器有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
加熱器,其他專業(yè)燈具,其他燈具配件,鹵鎢燈,
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://dgxianbo.cn.makepolo.com/contact_us.html?proid=100330892726">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>50.00</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100330892726.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100330892726.html" target="_blank" data-num="7" data-flag="0" title="自動點膠機、精密滴膠機不銹鋼單頭、單端電發(fā)熱管"><img src="http://jic.makepolo.cn/img/none.jpg" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="自動點膠機、精密滴膠機不銹鋼單頭、單端電發(fā)熱管"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="7" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100636398349.html">廠家熱銷 高功率單頭電加熱棒 精密加熱棒
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100636398349.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>


</tr>
<tr>


</tr>
<tr>


</tr>

</table>
</a>

<div   id="gn8cdul5"   class="s_product_intro plistk">
<a href="http://www.fhjczf.com/product-detail/100636398349.html" target="_blank" data-num="9"  data-flag="0">´---------------------------------------------------------------------------------------------------------</a><nobr>[<a href="http://www.fhjczf.com/product-detail/100636398349.html" target="_blank" data-num="2"  data-flag="0" class="s_product_intro_more">查看詳情</a>]</nobr>
</div>

</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
<a  data-num="3"  data-flag="0" target="_blank">
東莞千度電熱器材有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
溫度計,熱電偶,溫濕度控制器,塑料模,電熱管
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://hotmodo.cn.makepolo.com/contact_us.html?proid=100636398349">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>150.00</strong>元</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100636398349.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100636398349.html" target="_blank" data-num="7" data-flag="0" title="廠家熱銷 高功率單頭電加熱棒 精密加熱棒"><img src="http://img9.makepolo.cn/images/formals/img/product/269/765/3_5ecda70d79e797c5e9e2846bad91d847.jpg~tplv-2ri1qt4xxh-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="廠家熱銷 高功率單頭電加熱棒 精密加熱棒"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="6" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/101034262150.html">不銹鋼單頭加熱管 Φ6.35*60mm模具加熱棒 精密電阻小電熱管
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/101034262150.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>蘇工</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>SG-01</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>單頭電熱管</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>100（W）w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城市蘇工電熱設備有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱板,電熱片/發(fā)熱片,電熱圈,電熱器,電熱管
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://suugong.cn.makepolo.com/contact_us.html?proid=101034262150">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>15</strong>元/根</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/101034262150.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/101034262150.html" target="_blank" data-num="7" data-flag="0" title="不銹鋼單頭加熱管 Φ6.35*60mm模具加熱棒 精密電阻小電熱管"><img src="http://img11.makepolo.cn/images/formals/img/product/973/695/4_f215451f0424cf44fc57c404469694e7.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="不銹鋼單頭加熱管 Φ6.35*60mm模具加熱棒 精密電阻小電熱管"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="6" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100630319470.html">常熟單頭電熱管供應 常熟單頭電熱管廠家
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100630319470.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>常熟市海虞精密電熱元件廠</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>詳見說明</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>詳見說明</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>詳見說明</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>詳見說明w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇蘇州] <a  data-num="3"  data-flag="0" target="_blank">
常熟市海虞精密電熱元件廠
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
加熱器,電熱圈,電熱管,電熱片/發(fā)熱片
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://csjmdryj.cn.makepolo.com/contact_us.html?proid=100630319470">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>1</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100630319470.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100630319470.html" target="_blank" data-num="7" data-flag="0" title="常熟單頭電熱管供應 常熟單頭電熱管廠家"><img src="http://img12.makepolo.cn/images/formals/img/product/209/818/4_d7a9fd32c00cc8e337f4c6f242fb9abb.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="常熟單頭電熱管供應 常熟單頭電熱管廠家"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="1" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/100581709725.html">廠家供應精密單頭加熱管電熱管 電熱設備 有質保
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/100581709725.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>興泰</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>xt</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>單頭電熱管</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>800w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城市華邦合金電器有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱管,電熱圈
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://xtdq888.cn.makepolo.com/contact_us.html?proid=100581709725">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>15</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/100581709725.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/100581709725.html" target="_blank" data-num="7" data-flag="0" title="廠家供應精密單頭加熱管電熱管 電熱設備 有質保"><img src="http://img12.makepolo.cn/images/formals/img/product/632/170/4_c9b08d4acfaae354085fb71a5fafd8c2.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="廠家供應精密單頭加熱管電熱管 電熱設備 有質保"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

<div   id="gn8cdul5"   class="s_product_item">

<div   id="gn8cdul5"   class="s_product_content s_product_content_r">
<div   id="gn8cdul5"   class="s_product_title" score="1" pro_score="0">
<a target="_blank" class="plistk f14" data-num="1" data-flag="0" href="http://www.fhjczf.com/product-detail/101034921761.html">不銹鋼單頭加熱管模具加熱棒 精密電阻小電熱管
</a>

</div>
<div   id="gn8cdul5"   class="s_product_info">


<ul class="s_product_parameter">
<li id="gn8cdul5"    class="new_li">
<a href="http://www.fhjczf.com/product-detail/101034921761.html" data-num="9"  data-flag="0" target="_blank">
<table class="new_list">

<tr>
<td class="td_1"><div>品牌：</div></td>
<td class="td_2"><div>蘇工</div></td>
<td class="td_1"><div>型號：</div></td>
<td class="td_2"><div>SG-01</div></td>


</tr>
<tr>
<td class="td_1"><div>類型：</div></td>
<td class="td_2"><div>蘇工</div></td>
<td class="td_1"><div>加工定制：</div></td>
<td class="td_2"><div>加工定制</div></td>


</tr>
<tr>
<td class="td_1"><div>材質：</div></td>
<td class="td_2"><div>不銹鋼</div></td>
<td class="td_1"><div>功率：</div></td>
<td class="td_2"><div>100（W）w</div></td>


</tr>

</table>
</a>
</li>
</ul>


<div   id="gn8cdul5"   class="s_product_contact plistk">
[江蘇鹽城] <a  data-num="3"  data-flag="0" target="_blank">
鹽城市蘇工電熱設備有限公司
</a>

<span id="gn8cdul5"    class="s_product_line">|</span>
<a  data-num="3"  data-flag="0" target="_blank">
電熱板,電熱片/發(fā)熱片,電熱圈,電熱器,電熱管
</a>
<span id="gn8cdul5"    class="s_product_line">|</span>
<a   data-num="4" data-flag="0" rel="nofollow" data-pstate="0" data-conurl="http://suugong.cn.makepolo.com/contact_us.html?proid=101034921761">
查看聯(lián)系方式
</a>
</div>
</div>
<ul class="s_product_param">

<li id="gn8cdul5"    class="plistk" id="">
報價:<strong>15</strong>元/件</li>
<li id="fenlei"><a onclick="stat2_rf('36be0e3f215b480d98f15fce82e68fd3','pc_search_xp_1_show')" href="http://www.fhjczf.com/product-detail/101034921761.html#inquiryPop" target="_blank" rel="nofollow">點此詢價</a></li>
</ul>
<div   id="gn8cdul5"   class="clear"></div>
<div   id="gn8cdul5"   class="value_add_service_con">
<ul>
</ul>
</div>
</div>
<div   id="gn8cdul5"   class="s_product_pic">
<div   id="gn8cdul5"   class="s_product_pic_box"><a href="http://www.fhjczf.com/product-detail/101034921761.html" target="_blank" data-num="7" data-flag="0" title="不銹鋼單頭加熱管模具加熱棒 精密電阻小電熱管"><img src="http://img11.makepolo.cn/images/formals/img/product/973/695/4_f215451f0424cf44fc57c404469694e7.jpg~tplv-fg0x5eo1ce-mp:280:210.image" onload="if(this.height>this.width*0.75){if(this.height>88){this.height=88;} }else{if(this.width>118){this.width=118;} }" alt="不銹鋼單頭加熱管模具加熱棒 精密電阻小電熱管"  onerror="javascript:this.src='http://jic.makepolo.cn/caigou/new/images/none.jpg'" /></a></div>
</div>
</div>

產品推薦

彩票快三首页,彩票306官方版下载,德赢vwin入口,大发客户端在哪下载,真人投注下载,开心娱乐app官网入口,55彩票

精密單頭電熱管