问题 单项选择题

下列关于设备分配的叙述中,错误的是( )。

A.通常设备管理要建立设备控制块,但对通道管理则不用建立通道控制块

B.独占设备的独占性,是产生死锁的必要条件之一

C.SPOOLing系统的引入,是为了解决独占设备数量少、速度慢的问题

D.设备独立性是指,用户请求一类设备时并不知道系统将分配哪一台具体设备给他

答案

参考答案:A

解析: SPOOLing技术是为了解决独占设备数量少、速度低,不能满足多个进程使用设备而提出的一种设备管理技术。为提供操作系统的可适应性和可扩展性,需实现设备的独立性,即用户程序独立于具体使用的物理设备,当请求一类设备时并不知道系统将分配哪一台具体设备。

阅读理解

阅读下列短文,然后根据短文内容,选择最佳答案。

     One day, Mr Black went into a restaurant. He put his coat on a chair near the door. There was nothing

in the pockets of his coat. After he had his meal, he went to take his coat back. He found there was much

money in one of his pockets." Whose is this?" he thought. He saw a waiter near the door, so Mr Black

said to him, "Somebody put a lot of money in my coat. I have no time to wait for him. I have to go. Take

it, please. when he comes back, give it to him." The waiter took it and went away. At the moment, another

man came with a coat just like Mr Black's. "I'm sorry.", said the man. "I took your coat and you got mine.

please give me my coat and the money."  Mr Black answered, "I gave the money to the waiter. He'll give

it to you."

     Mr Black called the manager (经理), but the manager said, "We have no waiters here. We only have

waitresses (女服务员). He must be a thief (贼)!"

1. Mr black went out _____.

A. to eat something

B. to put his coat on a chair

C. to buy a coat

D. to see his friend

2. After his meal Mr Black _____

A. couldn't find any money in his coat

B. didn't know where he put his coat

C. found some money in the pocket of his coat

D. didn't take back his coat

3. Mr Black gave the money to _____.

A. the manager

B. the waiter

C. the waitress

D. the owner (主人)

4. The two coats looked _____.

A. quite different

B. the same

C. very dear

D. too cheap

5. Who is the thief?

A. Mr Black.

B. The manager.

C. The waitress

D. The waiter.

单项选择题