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【单选题】
5024 在可靠传输过程中出现差错时是通过()确认重传的A.
收到 ACK
B.
收到重传请求
C.
超时计时器到期
D.
收到重复请求
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举一反三
【简答题】电气 CAD 模板文件扩展名为 _ _ _ 。
【简答题】1 What seems to be the problem A. Use your imagination to speculate what the people are saying. B. You'll hear eight short phone calls. Match the NUMBERS of each call to one of these sentences. Put a ...
【单选题】The customer was______when told he might not have worn the headphones properly.
A.
annoyed
B.
surprised
C.
indifferent
D.
worried
【单选题】Directions: Read the following three passages. Each passage is followed by several questions or unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the one that...
A.
help travelers pass time
B.
attract lots of travelers to the UK
C.
allow travelers to make flexible plans
D.
cause travelers to pay more for accommodation
【单选题】Ms. Andrew had difficulty understanding _______the customer was trying to communicate to him.
A.
how
B.
what
C.
whether
D.
why
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