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【单选题】
设功率放大电路的输出功率为Po，电源供给该电路的功率为PE，功率晶体管消耗的功率为PT，则该放大电路的效率等于多少?( )A.
B.
C.
D.
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举一反三
【单选题】When we finally ______ to get home after the tiring long journey, we could hardly move a step further. [ ]
A.
tried
B.
succeeded
C.
attempted
D.
managed
【简答题】Hardly had we get home when it (begin) ______ to snow.
【单选题】We had to __________a lot of noise when the children were at home.
A.
go in for
B.
hold on to
C.
put up with
D.
keep pace with
【单选题】—When did you get home last night? —It was almost midnight ________ we arrived home.
A.
that
B.
before
C.
since
D.
when
【简答题】孔子是我国古代伟大的思想家、教育家，但他的思想在当时并未受到重视。孔子的思想者当时未收到重视的根本原因是（ ）。
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