如图所示电源电压u保持不变�动变阻器的最大阻值为r2当变阻器的�片在a端时电压表读数为2v�片在b端时电压表读数为1v则r1 Template




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tomski如图所示电源电压u保持不变�动变阻器的最大阻值为r2当变阻器的�片在a端时电压表读数为2v�片在b端时电压表读数为1v则r1 coloring