如图1所示电源电势为e内阻为r当�动变阻器r′的�片�右� 动时以下结论正的是 A.电源的总功率增大 B.r1的功率减小 C Template




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tomski如图1所示电源电势为e内阻为r当�动变阻器r′的�片�右� 动时以下结论正的是 a.电源的总功率增大 coloring