问题 问答题 简答题

处理机热备用的工作方式有哪几种?并说明每一种的特点。

答案

参考答案:

双处理机结构有三种工作方式:

(1)同步双工工作方式:由两台处理机中间加一个比较器组成。两台处理机合用一个存储器(也可各自配置一个存储器,这种配置方式,要求两个存储器的内容保持一致,应经常核对数据、修改数据)。两台处理机中的一台作主用机,另一台作备用机,同时接收信息,同时执行同一条指令,各自进行分析处理,再将其执行结果进行比较。如果结果相同,说明工作正常,由主处理机向外设发出命令,并转入下一条指令继续工作。如果结果不同,则立即退出服务,进行测试和必要的故障处理。为了使故障处理对呼叫处理的影响尽量的少些,终止正常处理的时间必须很短(例如不超过200ms)。这么短的时间只能做一些短的测试,测试结果发现有一台处理机不好,就令其退出服务。让另一台处理机工作,撤下来的处理机做进一步的检查。

(2)话务分担工作方式(互助):当一台处理机发生故障后,它的工作由另一台处理机负担。

(3)主/备工作方式:备用机只通电,不运行。当收到主机的转换请求后,开始接收数据,进行处理。

单项选择题 A2型题
阅读理解

A bully is a person who enjoys hurting other people. A bully can hurt people with words or by hitting them. 85% of children in the UK have been bullied at least once.

How can I tell if a person is a bully?

He or she will...

* try to find your weak point--perhaps you are shy, nervous or easily made worried.

* make fun of you in front of your friends.

* borrow money then won't pay you back.

What can I do if a bully bothers me?

* Tell the bully to leave you alone.

* Do not be afraid to ask other people for help, even though the bully tells you not to.

* Do not feel ashamed because you have been bullied. You have done nothing wrong! The bully should feel ashamed.

* Do not believe the bad things a bully says about you.

What should I do if I see a bully bothering someone?

* Help people who are being bullied, even though you don' t know them.

* Be a friend to people who are bullied.

* Tell a teacher if you see bullying.

* Tell bullies to stop, Sometimes bullies are afraid, too.

Why do some people become bullies?

Some bullies...

* have never learnt to think about other people' s feelings.

* don' t like themselves, so they are sad. They think they will be happy if they make another person sad.

* have been bullied themselves by other bullies.

Can bullies change? .

Yes! Bullies can change when they learn to think about other people' s feelings.

Sometimes bullies must be punished before they understand. Sometimes, bullies just need friends.

小题1:A bully often_______ .

A.makes people think about themselves

B.borrows money but doesn’t return

C.helps people when they are in trouble

D.thinks about other people' s feelings小题2:If you see a bully bothering your friends, you should________.

A.leave them alone

B.help them stop the bully

C.make them ashamed

D.tell them they are wrong小题3:Which of the following is true?______

A.Bullies say bad words to people.

B.Bullies like themselves very much.

C.Bullies make people around them happy.

D.Bullies must always be punished.