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小明做测定小灯泡的额定电功率的实验,电源电压6V,待测小灯泡的额定电压为“2.2V”和“3.8V”中的一个.(1)图甲是他所用的实验电路,其中有一根导线尚未连接,请用笔画线代替导线补上.要求:滑动变...
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