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【简答题】
用香农公式估算一下，假定信道带宽为3100Hz,最大传输速率为35000 bps，为了使信道信息传输速率增加62%，那么信噪比S/N需要增加 倍（已知：log102=0.30103，不用，估算取整数）。
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举一反三
【简答题】He wanted me to go swimming with him. →I ______ to go swimming with him.
【简答题】We go swimming twice a week．（对划线部分提问） ________ ________ ________ ________go swimming?
【单选题】What does the woman mean?
A.
She will not go swimming with the man.
B.
She will go swimming with the man.
C.
She doesn't like swimming.
【单选题】They would rather __________ than stay at home. A. go swim B. to go swimming C. go swimming D. to go swim
A.
go swim
B.
to go swimming
C.
go swimming
D.
to go swim
【单选题】Lucy, how about _________ this afternoon? [ ]
A.
go swimming
B.
going swim
C.
to go swimming
D.
going swimming
【简答题】（）稳定性是由垂尾产生的。所以飞机的垂尾做得很大，有时还需要选择腹鳍或双垂尾。
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