在图a所示的电路中电源电压保持不变电阻r1的阻值为10欧�动变阻器r2上标有“20Ω 1a 字样闭合电键s后电流表a的示数为0 Template




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tomski在图a所示的电路中电源电压保持不变电阻r1的阻值为10欧�动变阻器r2上标有“20Ω 1a 字样闭合电键s后电流表a的示数为0 coloring