??选择填空
三、选 择 填 空
Page 49 Unit 3 program storage document internal interface classify efficiently security system unauthorized function password user control detect input
Operating system for micro, mini, and mainframe computers perform many services. These services can be classified either as“external”or“internal”. The operating system provides external services that help users start programs, manage stored data, and maintain security. You, as the computer user, control these external functions. Using a command-line, menu-driven, or GUI user interface , an operating system provides you with a way to select the programs you would like to use. The operating system also helps you find, rename, and delete documents and other data stored on disks or tapes. On many, but not all computer systems , the operating system helps you maintain security by checking your user ID(用 户标识) and password , as well as protecting your data from unauthorized access and revisions(修改). The operating system provides internal services“behind the scenes”to ensure that the computer system functions efficiently . These internal services are not generally under your control , but instead are controlled by the operating system itself. The operating system controls input and output, allocates(分配) system resources, manages the storage space for programs and data, and detects equipment failure without any direction from you. Page 70 Unit 4 convert interpreter accomplish compile high-level send code create execute understand resulting process processor command run file
A programming language provides the tools a programmer uses to create software and produce a lengthy list of instructions, called source code ,which defines the software environment in every detail-what it looks like ,how the user enters commands ,and how it manipulates data. A computer’s microprocessor understands only machine language. Therefore, instructions written in a(n) high-level language must be translated into machine language before a computer can use them. The process of translating instructions from a high-level language into machine language can be accomplished by two special types of programs: compilers and interpreters . A compiler translates all the instructions in a program as a single batch(一批) ,and the resulting machine language instructions, called object code(目标代码),are placed in a new file . Most of the program files on a distribution CD for commercial software are compiled so that they contain machine language instructions that are ready for the processor to execute. As an alternative to a compiler, an interpreter converts one instruction at a time while the program is running . An interpreter reads the first instruction, converts it into machine language, and then sends it to the microprocessor. After the instruction is executed , the interpreter converts the next instruction, and so on.
1
??选择填空
Page 89 Unit 5 manage memory development engineer limit develop programming area performance technique store factor efficient system program environment
Software development is concerned with creating computer programs that perform efficiently. In developing computer software, computer scientists and engineers study various areas and techniques of software design, such as the best types of programming languages and algorithms to use in specific programs, how to efficiently store and retrieve information, and the computational limits of certain software-computer combinations. Software designers must consider many factors when developing a program. Often, program performance in one area must be sacrificed for the sake of the general performance of the software. For instance, since computers have only a limited amount of memory, software designers must limit the number of features they include in a program so that it will not require more memory than the system it is designed for can supply. Software engineering is an area of software development in which computer scientists and engineers study methods and tools that facilitate the efficient development of correct, reliable, and robust computer programs. Software engineers develop software tools and collections of tools called programming environments to improve the development process. For example, tools can help to manage the many components of a large program that is being written by a team of programmers. Page 116 Unit 6 computer proper communicate disk resource transmit enable network node limited bus convert dissimilar protocol connect bridge
A local area network(LAN) is a group of computers and other devices spread over a relatively limited area and connected by a communications link that enables any device to interact with any other on the network LANs commonly include microcomputers and shared (often expensive ) resources such as laser printers and large hard disks . Most (modern) LANs can support a wide variety of computers and other devices. Each device must use the proper physical and data-link protocols for the particular LAN, and all devices that want to communicate with each other on the LAN must use the same upper-level communications protocol .Although single LANs are geographically limited , separate LANs can be connected to form larger networks. Similar LANs are linked by bridges , which act as transfer points between networks;dissimilar LANs are linked by gateways(网关), which both transfer data and convert it according to the protocols used by the receiving network. The devices on a LAN are known as nodes(节点), the nodes are connected by cabling(电缆) and through which messages are transmitted . Nodes on a LAN can be wired together in any of basic layouts, known as bus , ring, and star.
2
  •  
 

相关内容

计算机专业英语

   Computer English 程序员如何掌握专业英语 杜士轩 Questions: How do you learn english ? What do you think is the most effective way to learn english? 1.The weightiness of Computer English. 《计算机专业英语》的重要性. 2.The differences between Computer English and Ecumenical Eng ...

计算机专业英语3

   unit 3 input and output 1-new words: 1. access v. 访问 Input and output devices provide a means for people to access a computer. 2.input device: keyboard, mouse 3.output device: printer , display screen/monitor 4. pixel 5. resolution n. 像素 n. 分辨率 The ...

计算机专业英语

   SINGAPORE - Computer sales in Asia outside Japan rose 16 percent to 7.4 million units in the March quarter compared with the previous year, research showed. Sales were slightly higher than expected, including in the key markets of Australia and Ind ...

计算机专业英语

   《计算机专业英语词汇》 编辑本段 A Active-matrix 主动矩阵 Adapter cards 适配卡 Advanced application 高级应用 Analytical graph 分析图表 Analyze 分析 Animations 动画 Application software 应用软件 Arithmetic operations 算术运算 Audio-output device 音频输出设备 Access time 存取时间 access 存取 accuracy 准确性 ...

计算机专业英语

   中等职业教育“十一五”规划教 材 计算机专业英语 杨利 方风波 科学出版社 主编 目录 第1章 第2章 第3章 第4章 第5章 第6章 第7章 第8章 计算机专业英语简介 计算机专业英语的词汇学习 屏幕英语 计算机说明书 计算机专业论文 网络英语 计算机专业英语试题汇编 阅读材料 第1章 计算机专业英语简介 1.1 计算机专业英语与普通英语的异同 " 1.1.1为什么要学习计算机专业英语 1.1.1为什么要学习计算机专业英语 " 1.1.2计算机专业英语与普通英语的相同点 1.1.2计算机 ...

计算机专业英语

   中等职业教育“十一五”规划教 材 计算机专业英语 杨利 方风波 科学出版社 主编 目录 第1章 第2章 第3章 第4章 第5章 第6章 第7章 第8章 计算机专业英语简介 计算机专业英语的词汇学习 屏幕英语 计算机说明书 计算机专业论文 网络英语 计算机专业英语试题汇编 阅读材料 第1章 计算机专业英语简介 1.1 计算机专业英语与普通英语的异同 " 1.1.1为什么要学习计算机专业英语 1.1.1为什么要学习计算机专业英语 " 1.1.2计算机专业英语与普通英语的相同点 1.1.2计算机 ...

计算机专业英语教程

   计算机专业英语教程 2010.5.1 Computer science major course Computer English Chapter 1 The History and Future of Computers As a computer science student,we should study English hard This book is very important to us Key points: useful terms a ...

计算机专业英语翻译

   计算机专业英语词汇 PC personal computer 个人计算机 IBM International Business Machine 美国国际商用机器公司的公司简称,是最早推出的个人 计算机品牌。 Intel 美国英特尔公司,以生产 CPU 芯片著称。 Pentium Intel 公司生产的 586 CPU 芯片,中文译名为“奔腾”。 Address 地址 Agents 代理 Analog signals 模拟信号 Applets 程序 Asynchronous communica ...

[西瓜外语通][词库]【专业英语】-《计算机专业英语》(带音标)(共3126)(1)

   +A【关于词库】《计算机专业英语》(3126个单词) \  \ 这是《计算机专业英语》的完整的《西瓜外语通》词库文件,共收录单词3126个; \  \ 本词库的词汇包括了计算机专业所有的基础词汇,把词库文件复制到软件的Data目录即可! \ \ 这是《西瓜外语通》附加的专业英语词库之一,特别献给需要的注册用户! \ \  \ ====《西瓜外语通》(Watermelon LanguageOK)【功能简介】==== \   \ 外语学习必备的,背单词、学句子、练听力(导出mp3)、单词批量翻译的 ...

计算机专业英语

   计 算 机 专 业 英 语 授 课 教 师 崔 丹 介绍计算机专业英语 一.计算机专业英语的特点: 1.专业性:a.词汇的多义性 b.公共词汇的专业性 2.客观性:通常使用第三人称 3.实用性 专业英语与公共英语 联系与区别 一.课堂要求:从精读到泛读 二.学习重点从语法,词汇分析到理解词 汇的发展变异灵活使用,提高写作 翻译能力。 专业英语阅读与翻译的准备 方法:SQ3R survey question read recite review S:浏览,读序言,查目录,看索引提要 Q:提问, ...

热门内容

初中英语语法总结一览表学习啊

   学英语简单吗?肯定会有许多学生说: 难死了 难死了”。 学英语简单吗?肯定会有许多学生说:“难死了 。 为什么有好多学生对英语的学习都感到头疼呢?答案只有一个: 不得法。 英语与汉语一样都是一种语言, “不得法 ” 为什么你说汉语会如此流利? 为什么有好多学生对英语的学习都感到头疼呢?答案只有一个: 不得法。 英语与汉语一样都是一种语言, 为什么你说汉语会如此流利? 那是因为你置身于一个汉语环境中,如果你在伦敦呆上半年,保准说起英语来会非常流利。但很多中学生没有很好的英语环境, 那是因为你置 ...

备战2010届高考英语复习第二十章??交际用语(测试卷)学生版

   专题二十??交际用语 专题二十??交际用语 ?? 【测试卷】 测试卷】 【A 组:基础过关】 1. “Don’t you believe me?” “, I’ll believe you say.” A. No; whatever C. No; no matter what B. Yes; no matter what D. Yes; whatever ?? . I feel a bit cold. 2.??Do you mind if I open the window? A. Of co ...

高二英语必修5Unit3 Language points课件

   高二人教新课标版必修五 Unit 3 Life in the future Language points 1. What changes do you expect to see in your life in one thousand years' time. 一千年之后你料想会发生什么变化. 一千年之后你料想会发生什么变化. expect (sb.) to do sth. 希望(某人) 希望(某人)做某事 I expect to be back within a week. I did ...

英语词汇中的哑音字母及拼写

   英语词汇中的哑音字母及拼写 ●1哑音字母b:字母b在m之后或t之前且mb, bt处于单词的末尾时(注意:member中的b发音,因为mb不在词尾),b往往不发音。如: (1)bomb炸弹;climb爬;comb梳子;crumb面包屑;dumb 哑;lamb羊羔;limb手足;mumb麻木的;thum b拇指;tomb坟墓。 (2)debt债务;doubt怀疑。 这两个词中字母b是中世纪时为了与拉丁语对应强加给英语的, 在英语的发音中b从来就没有出现过。 ●2 哑音字母c:indict起 ...

2009高中英语新课标词汇、短语

   课标词汇短语 课标词汇短语 词汇 A a bit (of) 有一点,一会儿 a few 一些,少量 a great deal 大量,许多 a good/great many 大量,许多 a kind of 一种,一类 a little 一点,少许 a lot of 许多,大量 a number of 一些,许多 a pair of 一双,一副 a piece of 一块(张,根,片) above all 首先,首要 according to 根据,按照 add up to 合计达…… aft ...