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怎么区分零线和火线_家居日记
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怎么区分零线和火线

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怎么区分零线和火线 1、看电线颜色：红色线一般为火线，蓝色线一般为零线。2、用电笔测：电笔会亮的是火线，不亮的是零线。3、看字母表示：若是字母L，则代表火线，若


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