如图所示的电路中电源电压恒定r1为定值电阻r2为�动变阻器.开关s闭合后�动变阻器的�片p在ab之间�动的过程中电压表的示数最大为 Template




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tomski如图所示的电路中电源电压恒定r1为定值电阻r2为�动变阻器.开关s闭合后�动变阻器的�片p在ab之间�动的过程中电压表的示数最大为 coloring