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现采用4级流水线结构分别完成一条指令的取指、指令译码和取数、运算以及送回运算结果4个基本操作，每步的操作时间依次为60ns、100ns、50ns和70ns。该流水线的操作周期应为（60）ns。若有一小段程序需要用20条基本指令完成（这些指令完全适合于在流水线上执行），则得到第一条指令结果需（61）ns，完成该段程序需（62）ns。在流水线结构的计算机中，频繁执行（63）指令时会严重影响机器的效率。当有中断请求发生时，若采用不精确断点法，则将（64）。 60（）
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W: David, I must say sorry to you.M: WhyW: Do you remember I borrowed several magazines from you last weekM: Yes, I lent you three magazines that day.W: But today I only can find two of them. I lost one. I’d pay it for you.M: It doesn’t matter. They are only some old magazines. You don’t need to return them to me if you can’t find them.W: But I’m really sorry for being so careless. I can buy another new magazine for you.M: No, I don’t want to hear anything like that. Let’s talk about anything else. Which is the best answer according to the dialogue().
Beijing World HotelBRAUHAUSHere we opened an excellent German bar. Guests will feel the atmosphere(气氛) of a bar in Berlin, enjoy real German beers and meals. Nightly live band performance(表演) from 21:00 hours onwards.Location: Ground Level, West Wing Building, Beijing World Trade Center.Opening Hours: 12:00 to 03:00 hours (Sun — Thu)12:00 to 05:00 hours (Fri — Sat)LOST HORIZONYou are the star at the Lost Horizon Karaoke room. Over 7000 selections(选择) of Mandarin, Japanese, Cantonese, Korean, Taiwanese and English songs are all for your singing pleasure.Location: Ground Level, East Wing Building, Beijing World Trade CenterOpening Hours : 19:00 to 01：00 hours (Sun — Thu)19:00 to 03:00 hours (Fri — Sat)GOURMETIt is so simple to prepare a great meal at home now that you can buy the best meats, milk products, wines, breads, cakes and more ... all under one roof.Location: Basement 1, Beijing World Trade CenterOperating Hours: 19:00 to 21:00 hours In BRAUHAUS, you can ().
Mr Baker is very happy to see Miss Green every morning because she is a good secretary.One Monday Miss Green didn’t come to work because she was ill. She had a terrible cold and a bad headache, so she phoned Mr Baker. (The telephone rings.)W: Good morning, Mr Baker.M: Good morning, Miss Green. What’s wrong Where are youW: I am at home. I’m ill. I’m afraid I’ve got a terrible cold and a bad headache.M: I’m very sorry to hear that. Well, you’d better stay at home.W: Thank you, Mr Baker. See you tomorrow.M: See you tomorrow. Goodbye.W: Goodbye, Mr Baker. Who is ill().
大容量的辅助存储器常采用RAID磁盘阵列。RAID的工业标准共有6级。其中 (48) 是镜像磁盘阵列，具有最高的安全性； (49) 是无独立校验盘的奇偶校验码磁盘阵列； (50) 是采用纠错海明码的磁盘阵列； (51) 则是无冗余也无校验的磁盘阵列，它采用了数据分块技术，具有最高的：I/O性能和磁盘空间利用率，比较容易管理，但没有容错能力。 48（）
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