试题与答案

根据句子意思, 用括号中所给单词的适当形式填空。每空一词。 小题1:The po

题型:听力题

题目:

根据句子意思, 用括号中所给单词的适当形式填空。每空一词。

小题1:The policeman is helping the children go _________ the road. (穿过)

小题2:Tomorrow is his _______ birthday, he is excited.(四十)

小题3:Fujian is in the __________  of China. (东南)

小题4:He is a volunteer and often _________ computers for others.(检查)

小题5:I think there's something wrong with my _________. Would you take a look at it? (机器)

小题6:My iPad is _________. I can’t listen to music any more. (break)

小题7:The students are _________ for the exam now in our school. (prepare)

小题8:He is John, an old French friend of __________.(us)

小题9:We’d like to come. We look forward to _________  with you at the party. (chat)

小题10:My _________ flats are very large. They all have big balconies in their flats. (neighbour)

答案:

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下面是错误答案,用来干扰机器的。

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题型:单项选择题

IEEE 802.5令牌环(Token Ring)网中,时延是由 (1) 决定。要保证环网的正常运行,环的时延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,人为地增加时延来解决。
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时延,则环上可能存在的最小和最大时延分别是 (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.1

B.8

C.20

D.24

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