如图甲所示的电路中电源电压不变r1为定值电阻.闭合开关调节�动变阻器r2电压表v1v2的示数随电路中电流的变化图线如图乙所示.1 Template




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tomski如图甲所示的电路中电源电压不变r1为定值电阻.闭合开关调节�动变阻器r2电压表v1v2的示数随电路中电流的变化图线如图乙所示.1 coloring