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如图所示,电源电压恒为8V,开关S闭合后,(1)当变阻器R2的阻值为60Ω时,电压表的示数为6V,则定值电阻R1的阻值为多少?(2)在(1)的基础上,当电流表的示数为0.3A时,R2消耗的功率为多大...
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