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b端移动到a端时测得电阻r1两端的电压与通过电阻r1的电流的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b端移动到a端时测得电阻r1两端的电压与通过电阻r1的电流的变化关系 coloring