如图8所示的电路,电源电压为3V,闭合开关,电压表示数为1V,则

如图8所示的电路,电源电压为3V,闭合开关,电压表示数为1V,则灯泡L2两端的电压为______V灯泡L1L2的电功率之比为         

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