在如图所示的电路中电源电压为12伏且保持不变定值电阻r1的阻值为20欧�动变阻器r2上标有“20Ω 1a 字样.闭合电键s电压表示数为 Template




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tomski在如图所示的电路中电源电压为12伏且保持不变定值电阻r1的阻值为20欧�动变阻器r2上标有“20Ω 1a 字样.闭合电键s电压表示数为 coloring