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【单选题】
已知晶体管的输入信号为正弦波，下图所示输出电压波形产生的失真为( )。A.
饱和失真
B.
交越失真
C.
截止失真
D.
频率失真
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举一反三
【单选题】It was silly ____ you to give up ____ things that we all wanted.
A.
for, to do
B.
for, doing
C.
of, to do
D.
of, doing
【单选题】听力原文：M: It looks like we won't have enough time to do all we wanted to. F: Who says we won't? Let's get going. Q: What does the woman mean? (19)
A.
She wants to know who said they won't.
B.
She also doubts whether they can finish on time.
C.
She asks the man to go with her.
D.
She is confident of completing all they wanted to.
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