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小明在“测小灯泡电功率实验”中，电路图如图甲所示，电源电压为8V，小灯泡L的额定电压为2.5V，正常发光时的电阻约为10Ω，可供选用的滑动变阻器R1、R2和R3的最大阻值分别为5Ω、20Ω、50Ω．...
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