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举一反三
【单选题】有一电阻、电感和电容串联电路，R=600Ω，L=1.911亨，C=5.308μF，电路电压U=220V、ｆ＝50Hz,该电路的电流为。
A.
0.25A
B.
0.3A
C.
0.37A
D.
0.45A
【单选题】It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.
A.
produced
B.
producing
C.
to produce
D.
having produced
【单选题】Over time, my remaining hearing dropped to 20 percent, where it is today.
A.
Gradually I lost more of my hearing until I was 80 percent deaf, as I currently remain.
B.
Soon I lost 20 percent of my hearing after I moved to where I’m living today.
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