、如图所示,闭合开关,电灯不亮,用试电笔(也称测电笔)接触D点时

、如图所示,闭合开关,电灯不亮,用试电笔(也称测电笔)接触D点时氖管发光,接触E点时不发光,说明DE         。若试电笔接触AF各点都发光,说明                        

 

答案

断路  进户线零线断路

解析:略

 

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