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如图所示,电源电压恒定,R1为20Ω,闭合开关S,断开开关S1时电流表示数为0.3A;若闭合S1电流表示数为0.5A,通过R2的电流为 ,则电源电压是 ,R2电阻阻值为 .
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教案备课库《17.4欧姆定律在并联电路中的应用(五)——综合2》真题及答案
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