如图所示电路中电源电压保持不变闭合开关s后将�动变阻器r2的�片p�右移动在此过程中 A.电流表a示数变大电压表v2示数变小b.电流 Template




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tomski如图所示电路中电源电压保持不变闭合开关s后将�动变阻器r2的�片p�右移动在此过程中 a.电流表a示数变大电压表v2示数变小b.电流 coloring