如图a所示的电路中电源电压保持不变闭合开关s后�动变阻器的�片p由a端移动到b端时测得电阻r两端的电压u与通过电阻r的电流i的变化关系 Template




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tomski如图a所示的电路中电源电压保持不变闭合开关s后�动变阻器的�片p由a端移动到b端时测得电阻r两端的电压u与通过电阻r的电流i的变化关系 coloring