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在用“伏安法测电阻 时.所选择的电源电压为4.5?V.被测电阻的阻值约为l0Ω.则选择电路时电压表.电流表的量程选择为( )A. 0-3V.0-3A B. 0-3V.0-0.6AC. 0-15V.0-3A D. 0-15V.0-0.6A D [解析]电源电压为U=4.5V>3V.则电压表选0?15V的量程.故AB不正确, 由I=可得.电路中的最