如图所示的电路中电源电压不变�动变阻器的最大阻值为20Ω.闭合开关s�片p在a端时电压表示数为1v�片p在b端时电压表示数为3v Template




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tomski如图所示的电路中电源电压不变�动变阻器的最大阻值为20Ω.闭合开关s�片p在a端时电压表示数为1v�片p在b端时电压表示数为3v coloring