题目
Tomorrow will be fine. Shall we go out for a picnic?
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A. Sounds great!
B. Good luck!
C. Have fun !
第4题
第5题
第7题
A.Active close, passive close, FIN, ACK
B.Passive close, Active close, FIN, ACK
C.Active close, passive close, ACK, FIN
D.Passive close, active close, ACK, FIN
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