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2.布电线目前使用的导体材料主有铜和铝。在选购时首先应根据使用的负载选择相应的规格，如照明线路使用1.5平方毫米的铜线或2.5平方毫米的铝线，空调、微波炉、烤箱等使用2.5平方毫米的铜线或4平方毫米的铝线，选择合适规格的电线可避免由于小规格电线载流量不够引起短路发生火灾；其次选购时应注意导体的质量，合格的铜芯电线应使用紫红色、有光泽、手感软的铜材，而伪劣的铜芯线铜芯为紫黑色、偏黄或偏白，杂质多，机械强度差，韧性不佳，稍用力即会折断，而且如果是多股铜丝常有断线现象，使用寿命短。<br /> <br /> 3.布电线使用的外皮为聚氯乙烯绝缘材料。合格的电线绝缘应该外观光滑、表面印字清晰。从电线头观察，绝缘应均匀，不偏芯。有些伪劣电线绝缘层看上去似乎很厚实，实际上大多是用再生塑料制成的，时间一长，绝缘层会老化而漏电。<br /> <br /> 4.质量好的电线，一般都在规定的重量范围内。价格上，由于假冒伪劣电线的制作成本低，因此，商贩在销售时，常以价廉物美为幌子低价销售，让人上当。</p><div class="clear"></div> </div> <div class="blank30"></div> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=526"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <script language="JavaScript"> function shutwin(){ window.close(); return;} </script> <div class="blank30"></div> <div class="line_2"></div> <div id="tool"> <ul> <li><a href="javascript:window.print()" class="print">打印本文</a></li> <li><a href="javascript:shutwin()" 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