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【单选题】
直流放大器存在的主要问题是（）。A.
截止失真
B.
饱和失真
C.
交越失真
D.
零点漂移
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举一反三
【单选题】I don ' t think there is ______in the book on the desk. [
A.
] something important [
B.
] anything important [
C.
] important something [ D] important anything
【单选题】He can’t tell us ________, I think.
A.
important anything
B.
anything important
C.
important something
D.
something important.
【单选题】.Jennifer didn’t attend the important conference,and that’s _________she hadn’t been gotinformed of it.
A.
why
B.
the reason
C.
because
D.
for
【判断题】According to the writer, if something only takes two minutes, it can’t be very important.
A.
正确
B.
错误
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