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【简答题】
2071使用每个信号元素8个电平级的传输方案,在PSTN上传输数据。如果PSTN的带宽是3000Hz,试利用Nyquit定理求出最大数据传输速率C和调制效率B。
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反馈参考答案：
举一反三
【判断题】Nowadays, some airports offer self check-in with baggage service so that passengers with checked luggage can also check in by themselves.
A.
正确
B.
错误
【单选题】_____ got into the room than it began to rain heavily.
A.
No sooner have they
B.
No sooner they have
C.
No sooner had they
D.
No sooner they had
【多选题】What would you do if your baggage is missing?
A.
Calm down.
B.
Show the ticket and describe the detail of your lost baggage, for example the number of missing baggage, the color, the brand, etc.
C.
Fill in the lost baggage form.
D.
go to the Baggage Service Office in the baggage claim area
【简答题】They had no sooner entered the theatre than the performance began. (no sooner)
【单选题】___________90t in thewheat than it began to rain heavily．
A.
No sooner hadthey
B.
No sooner have they
C.
No sooner they
D.
No sooner they had
【单选题】No sooner they rushed out into the street.
A.
did they hear the news than
B.
did they hear the news when
C.
had they heard the news than
D.
had they heard the news when
【简答题】No sooner they rushed into the room.A. did
they hear the loud noise than B. did they hear the loud noise when C. had they heard the loud noise than D. had they heard the loud noise when
【简答题】实训十一 海运单证缮制.doc
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