计算机系统的可靠性通常用__( )__来衡量。A．平均响应时间 B．_爱下问搜题

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问题单项选择题

计算机系统的可靠性通常用__( )__来衡量。

A．平均响应时间

B．平均故障间隔时间

C．平均故障时间

D．数据处理速率

答案

参考答案：B

完形填空

完形填空。

     Our school has a library. There are many  1 in it. All the students in our school can borrow books  2
the library, but you can't  3 them for more than two weeks. Everyone must give back the library books  4 .
One afternoon, Miss Yang was working at her desk in the library when Han Mei  5 ." Excuse me, Miss Yang,"
She said." I'm very sorry. I borrowed a book ten days ago. But I can't  6 it. I think I've lost it.""Oh dear!"
said Miss Yang,"What was the name of the book?"" It was 'Harry Potter'.""What a pity! I'm  7 that if you've
lost it, you must pay for (偿还) it," said Miss Yang. Just then Lucy came into the library." Excuse me, Miss
Yang. I've just found this book. I like this book very much, but I think it's the 8 , so I come to  9 ." "Oh,
good girl!" Miss Yang got the book and said."It's 'Harry Potter'. Come on, Meimei! Is it the book you've
lost?" "Yes," Han meimei said." Thank you, Miss Yang!""Don't thank me, we  10 thank Lucy!" said Miss
Yang.

( )1. A. kind of books
( )2. A. from
( )3. A. keep
( )4. A. in the time
( )5. A. comes
( )6. A. find
( )7. A. sadly
( )8. A. library
( )9. A. given it back
( )10. A. and

B. kinds of books
B. at
B. borrow
B. at times
B. came in
B. looks
B. sorry
B. library's
B. give it back
B. both

C. kinds of book
C. out
C. had
C. on time
C. will come
C. looking
C. glad
C. Lily's
C. gave back
C. or

D. kind of book
D. to
D. has
D. some time
D. was come
D. found
D. happy
D. Lucy's
D. gave it back
D. either

选择题

学会整理和归纳是自主学习的重要手段。下列对有关主题知识的归纳完全正确的一组是

A．物质用途	B．元素之最
液态氧气──火箭的燃料二氧化碳──常见的灭火剂	人体中含量最多的元素──氧元素地壳中含量最多的金属元素──硅元素
C．人体健康	D．微粒性质
缺钙──易患骨质疏松缺铁──易患贫血病	热胀冷缩──微粒大小随温度改变湿衣服晾干──微粒间有间隙