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【单选题】
正弦波振荡电路中的正反馈网络的作用是 。A.
保证电路满足相位平衡条件
B.
提高放大电路的放大倍数
C.
使电路产生单一频率的正弦波
D.
保证放大电路满足幅值条件
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反馈参考答案：
举一反三
【单选题】I'll come when you are _______ help.
A.
on need of
B.
in need of
C.
at need for
D.
in need
【单选题】According to the passage, a man wants a wife because ______.
A.
he needs someone to help with his studies
B.
he feels lonely without her
C.
he cannot have clean clothes to wear without a wife
D.
material comforts can not be attained without a wife
【单选题】I need help _____my English,but I can help you______your Chinese.
A.
for,with
B.
for,for
C.
with,for
D.
with,with
【单选题】I couldn’t______cry while I was watching the movie “Titanic”.
A.
help to
B.
help
C.
help but to
D.
help but
【单选题】The magician picked several people______from the spectators and asked them to help him with the performance.
A.
by chance
B.
at random
C.
on occasion
D.
on average
【简答题】A． Take pride in B． Talk about C． Help with D． Talk to
【单选题】---Is Kate serious? ---I _________. She never means it. [ ]
A.
suppose
B.
agree
C.
believe
D.
wonder
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