如图所示是用电流表和电压表测电阻的电路图闭合开关后�现电压表示数为3 V而电流表示数为零则可能出现的故障是 A.�动变阻器断路 Template




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tomski如图所示是用电流表和电压表测电阻的电路图闭合开关后�现电压表示数为3 v而电流表示数为零则可能出现的故障是 a.�动变阻器断路 coloring