问题 问答题 简答题

局部计算机网络和分布式计算机控制与管理系统有什么关系?

答案

参考答案:

局部计算机网络技术对分布式计算机控制与管理系统的发展有很大影响,它不仅以微型机多机系统的形式,通过连网通信,构成多种结构形式的分布式系统,广泛应用于办公自动化、工业企业控制与管理,实验室测试与控制等方面,遍及教育、科研与开发、工业、农业、商业、军事等部门,而且随着通信技术的发展与不断完善,对大型计算机信息系统的结构与发展也产生了重大影响。图6—9就是目前正在形成的大型计算机信息系统的一种典型结构,其中各部门的网络系统都是局部计算机网络。它们通过网间接口(G:Gateway)连到公共数据网络上,形成某个地区的信息系统,这些信息系统又可以进一步连接起来形成全国性的、甚至全世界性的信息系统。目前迅速发展的信息高速公路技术就是针对这种需要而开发的。

阅读理解

阅读理解

                                                         Learning a Second Language

   Some people learn a second language easily. Others have trouble learning a new language. How

can you help yourself learn a new language, such as English? There are several ways to make learning

English a little easier and more interesting.

   The first step is to feel positive about learning English. If you believe that you can learn, you will learn.

Be patient. You do not have to understand everything all at once. It is natural to make mistakes when

you learn something new. We can learn from our mistakes. In other words, do not worry about taking

risks.

   The second step is to practice your English. For example, write a diary every day. You will get used

to writing it in English, and you will feel comfortable expressing your ideas in English. Several weeks later, you will see that your writing is improving. In addition, you must speak English every day. You can

practice with your classmates outside class. You will all make mistakes, but gradually you will become

comfortable communicating in English.

   The third step is to keep a record of your language learning. You can write this in your journal. After

each class, think about what you did. Did you answer a question correctly? Did you understand

something the teacher explained? Perhaps the lesson was difficult, but you tried to understand it.

   You must be positive about learning English and believe that you can do it. It is important to practice

every day and make a record of your achievements. You will enjoy learning English, and you will feel

more confident in yourself.

1. To feel positive about learning English means _______.

A. if you are patient, you will learn    

B. you can understand everything all at once

C. if you make mistakes, you can learn from your mistakes

D.if you believe you can learn, you will learn

2. When you learn English, you do not need to ______.

A. be patient                        

B. make mistakes  

C. express your ideas in English      

D. understand everything all at once

3. What is not helpful for you to enjoy learning English?

A. To communicate in English.  

B. To worry about taking risks.

C. To think about what has been done after each class.  

D. To make a record of the achievements.

4. What is the main idea of this passage?

A. It is very important to learn a second language.

B. Some people learn a second language easily while other people do not.

C. There are ways to help you learn a second language more easily.

D. Don't worry about taking risks when learning a second language.

5. What does the underlined word "journal" in the 4th paragraph mean? 

A. Diary          

B. Composition        

C. Poem        

D. Newspaper

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