如何判断电压表测的电源电压还是一根导线的电压(二者顺着电路走完找测的对象时都没有用电器了)? 知乎 Template




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tomski如何判断电压表测的电源电压还是一根导线的电压(二者顺着电路走完找测的对象时都没有用电器了)? 知乎 coloring