WDM光传输网属于()的光信号处理,类似于现存的电路交换网,是粗粒度的信道分割。
A.线路级
B.比特级
C.分组级
D.时隙级
参考答案:A
为了参加2011年威海国际铁人三项(游泳,自行车,长跑)系列赛业余组的比赛,李明针对自行车和长跑项目进行专项训练。某次训练中,李明骑自行车的平均速度为每分钟600米,跑步的平均速度为每分钟200米,自行车路段和长跑路段共5千米,用时15分钟。求自行车路段和长跑路段的长度。
根据句意及首字母或括号里的汉语或单词提示,补全下列句中所缺单词,注意其形式的变化。
(每空限填一词)
1. Mind your table manners. It is _____ (polite) to talk with your mouth full.
2. Miss Wang speaks English with excellent _____ (pronounce).
3. Tony is badly ill. We are all _____ (care) about his health.
4. J_____ is the first month of the year.
5. If you try your best, I'm sure you can a_____ your dream one day.
6. Pandas' favorite food is bamboo l_____.
7. Robert enjoys _____ (收集) stamps. And now he has 300 of them.
8. She will be the _____ (第五个) to speak at the meeting.
9. I am really sorry I was late. I just _____ (错过) the early bus this morning.
10. Nancy is _____ (在楼下). Go and find her yourself.