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【单选题】
IEEE 802.5令牌环(Token Ring)网中，是由(1)决定。要保证环网的正常运行，环的必须有一个最低限度，即(2)。如果达不到这个要求，可以采用的一种办法是通过增加电缆长度，人为地增加来解决。 设有某一个令牌环网长度为400m，环上有28个站点，其数据传输率为4Mbit/s，环上信号的传播速度为200m/μs，每个站点具有1bit，则环上可能存在的最小和最大分别是(3)bit和(4)bit。当始终有一半站点打开工作时，要保证环网的正常运行，至少还要将电缆的长度增加(5)m。A.
站点和信号传话
B.
令牌帧长短和数据帧长短
C.
电缆长度和站点个数
D.
数据传输单和信号传播速度
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举一反三
【单选题】Last year I _____ my dad to give up smoking, but failed. [ ]
A.
advised
B.
persuaded
C.
tried to advise
D.
talked
【简答题】Mr. Black gave up smoking last year.
【单选题】What did Tiger do last year?
A.
He joined a health club.
B.
He stopped smoking.
C.
He got a good job.
【单选题】You ought to ________ smoking; I gave it up last year. ( )
A.
give up
B.
give out
C.
give away
D.
give to
【单选题】Smoking hasn't been allowed in public places since May lst last year. It may be a good chance for people to smoking.
A.
put up
B.
give up
C.
pick up
D.
look up
【简答题】He ___smoking last year.
【单选题】Mr. Li no longer smokes now because his wife _____ him to give up smoking last year. [ ]
A.
suggested
B.
advised
C.
persuaded
D.
told
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