如图甲所示的电路中 电源电压保持不变 为定值电阻 r为�动变阻器。闭合开关s 移动�片p �动变阻器消耗的电功率 出卷� Template




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tomski如图甲所示的电路中 电源电压保持不变 为定值电阻 coloring