问题 单项选择题

NetWare文件系统实现了多路硬盘处理和高速缓冲算法,加快了硬盘通道的访问速度。下面叙述中不属于高效访问硬盘机制的是______。

A.目录Cache与Hash

B.文件Cache与后台写盘

C.重定向程序NetWare Shell

D.电梯升降查找算法与多硬盘通道

答案

参考答案:C

解析: 在网络环境中,硬盘通道的工作是十分繁重的,由于服务器CPU与硬盘通道两者的操作是异步的,当CPU在完成其他任务的同时,必须保持硬盘的连续操作。为了实现这一点,NetWare文件系统实现了多路硬盘处理和高速缓冲算法,加快了硬盘通道的访问速度。它采用的高效访问硬盘机制主要有:目录Cache与目录Hash、文件Cache、后台写盘、电梯升降查找算法与多硬盘通道等。NetWare Shell是工作站运行的重定向程序,它主要负责对用户命令进行解释。

阅读理解

阅读理解。

  In 1638, John Harvard donated some money and about four hundred books

to a new university. This was the beginning of the library at Harvard University.

The gift was so important that the university was named for John Harvard.

  Thomas Bray began the first free lending library in the late 1600s. He set up

more than 30 or these libraries in the American colonies. However, the idea for

this kind of free library ended when Bray died in 1730. In 1731, Benjamin

Franklin and some friends started the first subscription library in the United

States. In a subscription library people pay money to become members, but they

may borrow the books without paying again.

  In the United States, every child had a free education. This idea soon led to

free libraries. One of the first libraries that used tax money to buy books was a

library in Peterborough, New Hampshire. This library was set up in 1833.

1. The main idea of paragraph 2 is _____.

A. Franklin started the first subscription library

B. in a subscription library people pay money to become members

C. Bray and Franklin were important in the history of public libraries

D. Bray died in 1730 and Franklin died in 1833

2. The underlined word "borrow" means _____.

A. read and write with no help from another person

B. use for a short time and then return

C. like very much

D. lend

3. The reading does not say it, but we can guess that _____.

A. there were free schools in the United States before there were free libraries

B. free schools and free libraries in the United States began at about the same

time

C. the library in New Hampshire also had a free school in it

D. there were free libraries in the United States before there were free schools

4. Havard University began _____.

A. in 1731

B. in 1730

C. in 1833

D. in 1638

5. At the library that Franklin started, _____.

A. children could use books for no money at all

B. people paid a little money in the beginning but none after that

C. people paid a lot of money in the beginning but none after that

D. both A and B

填空题