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【单选题】
一度电可供“220V,40W”的灯泡正常发光的时间是( )A.
20小时；B、40小时；C、45小时；D、25小时。
B.
2V,6W”的灯泡接入的电路中，通过灯丝的实际电流是（ ）
C.
2；
D.
1；
E.
0.5；
F.
0.25。
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