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电线接地怎么查_家居日记
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电线接地怎么查

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电线接地怎么查 将万用表的电压调至250V，要求必须是交流档，然后用试电笔确定好火线孔，再用黑笔对零线和火线间的电压进行测量，再测量地线和火线之间的电压，如果接


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