如图所示的电路中电源两端的电压保持不变当�动变阻器的�片p�到c位置时电压表示数为4v灯l正常�光当�片p�到b端时电压表示数为 Template




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tomski如图所示的电路中电源两端的电压保持不变当�动变阻器的�片p�到c位置时电压表示数为4v灯l正常�光当�片p�到b端时电压表示数为 coloring