如图所示的电路中r1为定值电阻r2为�动变阻器电源电压不变闭合开关s后�片p从a端移动到b端电流表示数i与电压表示数u的变化关系如 Template




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tomski如图所示的电路中r1为定值电阻r2为�动变阻器电源电压不变闭合开关s后�片p从a端移动到b端电流表示数i与电压表示数u的变化关系如 coloring