全国计算机等级考试四级笔试模拟试题
全国计算机等级考试四级笔试模拟试题
软件测试工程师，编写软件测试方案、测试文档，与项目组一起制定软件测试阶段的工作计划，能够在项目运行中合理利用测试工具完成测试任务。下面是小编分享的2017年全国计算机等级考试四级笔试模拟试题，欢迎大家练习！
下列各题A)、B)、C)、D)四个选项中,只有一个是正确的,请将正确选项涂写在答题卡相应位置上,答在试卷上不得分。
(1) 若逻辑变量X=Y=1,则执行按位加X?Y以后的值为_____。
A) 1 B) 0 C) 10 D) 2
(2) 在计算机内进行加减运算时,最常用的码是_____。
A) 原码B) 反码C) 补码D) ASCII码
(3) 计算机中对操作数进行逻辑左移1位,一般它的最低位是_____。(2分)
A) 0 B) 1 C) 不变D) 不确定
(4) 下面命题公式中哪一个的主析取范式中含3个极小项?_____。(2分)
A) p∨q∨r B) (p∧q)(┐p∧q∧r)
C) p→(q∧r) D) ┐(p∧┐q)∧(r∨q)
(5) 公式
（xF(x,y)→$yG(y)）→xH(x,y)
的前束范式是
A) xtw((F(x,y)→G(t))→H(w,y))
B) x$tw((F(x,y)→G(t))→H(w,y))
C) x$y((F(x,y)→G(y))→H(x,y))
D) $x$t$w((F(x,y)→G(t))→H(w,y))
(6) 下面集合之间的包含和属于关系中哪些为真?_____。
Ⅰ. ? í ?
Ⅱ. {?} ? {?,{?, {?}}}
Ⅲ. {a,b} í {a,b,{a,b}}
Ⅳ. {a,b} ? {a,b,{a,b,c}}
A) Ⅰ和ⅡB) Ⅰ和ⅢC) Ⅰ和ⅣD) Ⅱ、Ⅲ和Ⅳ
(7) 设N为自然数集合,Z为整数集合,Q为有理数集合,N奇为全体奇数集合,(a,b)和(0,1)为两个开区间,下列等势关系中哪个为假? _____。
A) Q ≈ N
B) Z ≈ N奇
C) (0,1) ≈ Q
D) (a,b) ≈ 2N,其中2N为N到2= {0,1}的全体函数集合
(8) 设N为自然数集合,＋,－,分别为普通的加法、减法和乘法。在下面四种情况下不构成代数系统的为_____。
A) x*y=x+y-2x.y B) x*y=x+y
C) x*y=x.y D) x+y=|x|+|y|
(9) 无向完全图K有多少个非同构的连通的生成子图?_____。(2分)
A) 11 B) 9 C) 8 D) 6
(10) 设G为n(n≥2)阶无向连通图,下面哪些(个)命题必为真?_____。
Ⅰ.若G有割点,则G一定有桥
Ⅱ.若G有桥,则G一定有割点
A) 仅ⅠB) 仅ⅡC) 全不一定为真D) 全一定为真
(11) 以下哪一个术语与数据的存储结构有关? _____。
A) 栈B) 队列C) 散列表D) 串
试题(12)-(13)基于下面的叙述：:现有关键码值分别为10、20、30、40、的4个结点,
按所有可能的插入顺序去构造二叉排序树。
(12) 能构造出多少种不同的二叉排序树? _____。(2分)
A) 24 B) 14 C) 10 D) 8
(13) 这些二叉排序树中有多少棵是最佳二叉排序树?_____。
A) 6 B) 5 C) 4 D) 3
(14) 下面关于事件结点网络中关键路径的叙述,哪一个是正确的?_____。
A) 关键路径是从开始结点到完成结点的具有最小长度的路径,关键路径的长度就是完成整个工程所需的最短时间。
B) 关键路径是从开始结点到完成结点的具有最大长度的路径,关键路径的长度就是完成整个工程所需的最短时间。
C) 关键路径是从开始结点到完成结点的具有最小长度的路径,关键路径的长度就是完成整个工程所需的最长时间。
D) 关键路径是从开始结点到完成结点的具有最大长度的路径,关键路径的长度就是完成整个工程所需的最长时间。
(15) 对线性表进行二分法查找,其前提条件是_____。
A) 线性表以链接方式存储,并已按关键码值排好序
B) 线性表以链接方式存储,并已按关键码值的查找频率排好序
C) 线性表以顺序方式存储,并已按关键码值排好序
D) 线性表以顺序方式存储,并已按关键码值的查找频率排好序
(16) 下列排序方法中,哪一种方法的比校次数与记录的初始排列状态无关?_____。(2分)
A) 直接插入排序B) 起泡排序
C) 快速排序D) 直接选择排序
(17) 在程序状态字PSW中设置了一位,用于控制用户程序不能执行特权指令,这一位是_____。
A) 保护位B) CPU状态位
C) 屏蔽位D) 条件位
(18) 作业装入内存后,在其运行过程中,不仅允许其搬家,而
且还可以再申请存储空间并得到分配,这种存储策略称为_____。
A) 直接分配B) 间接分配
C) 静态分配D) 动态分配
(1l (21) 假设一个计算机系统,在一段时间T内,运行用户程序所用的时间为T1,运行操作系统程序对用户提供服务所用的时间为T2,运行操作系统做系统管理工作所用的时间为T3。那么计算机系统的运行效率为_____。(2分)
A) T1/T2+T3 B) T1/T1+T2+T3 C) T1+T2/T D) T1+T3/T
(22) 下列关于UNIX的叙述中,正确的是_____。
Ⅰ. UNIX是一个多用户多任务操作系统
Ⅱ. UNIX支持很多正文编辑器
Ⅲ. UNIX文件系统可以安装或拆卸
A) Ⅰ和ⅡB) Ⅰ和ⅢC) Ⅱ和ⅢD) Ⅰ,Ⅱ和Ⅲ
(23) 启动DOS时若屏幕上显示:Disk boot failure,表示_____。
A) 启动盘的https://www.360docs.net/doc/bd18989270.html,和https://www.360docs.net/doc/bd18989270.html,文件丢失
B) 启动盘的https://www.360docs.net/doc/bd18989270.html,文件丢失
C) 妄动盘上无操作系统
D) 妄动盘的引导区数据错误
(24) 下面列出的数据模型中,哪一个不是结构数据模型?_____。
A) 网状模型B) 关系模型C)层次模型D) 实体联系模型
(25) 下面列出的条目中,哪个或哪些是属于数据库技术研究的内容?_____。
Ⅰ. 数据库存储
Ⅱ. 数据库结构
Ⅲ. 数据库设计
Ⅳ. 数据库使用
A) 只有ⅠB) Ⅰ和ⅡC) Ⅰ、Ⅱ和ⅢD 都是
(26) 在关系数据模型中,外键(Foreign Key)是_____。(2分)
A) 在一个关系中定义了约束的一个或一组属性
B) 在一个关系中定义了缺省值的一个或一组属性
C) 在一个关系中的一个或一组属性是另一个关系的主键
D) 在一个关系中用于唯一标识元组的一个或一组属性
(27) 在关系SC(student_id,student_name,course_id,grade)中,有_____。
student_id,course_id→grade
student_id → student_name
关系SC最高达到哪级范式? (2分)
A) 不满足B) 1NF C) 2NF D)3NF
(28) 下面列出的关系代数表达式的等价变换规则中,哪一个式子不一定成立?_____。(2分)
A) Л A1,A2,…,An (σF (E)) ≡ σF (Л A1,A2,…,An (E))
B) E1∞E2 ≡ E2∞E1
C) (E1∞E2)∞E3 ≡ E1∞(E2∞E3)
D) σF1(σF2 (E) ≡ σF1 ∧F2 (E)
(29) 下列的SQL语句中,哪一个语句不是数据定义语句? _____。
A) CREATE B) DROP C) GRANT D) ALTER
(30) 将E-R图中的实体和联系转换为关系,这是数据库设计中哪个阶段的任务?_____。
A) 需求分析B) 概念设计C) 逻辑设计D) 物理设计
(31) 关于课程信息的表C列出如下,且c_id 为主键。
c_id5) C_nameChar(10) Teacher12)
C_001 DATABASE Zhang_Ling
C_002 NETWORK Li_Ming
E_101 ENGLISH Wang_Jun
M_201 MATH Chen_Hong
若用如下语句建立表SC:
CREATE TABLE SC (s_id 5) not null,c_id 5) not null,grade integer) 其中s_id为主键,c_id为外键(是C表的主键)。当执行如下语句时，哪个语句不能执行?_____。(2分)
A) SC values (`99011’, `C-001’, 75)
B) SC values (`99318’, `A-101’, 80)
C) SC values (`99410’,` E-101’, 93)
D) SC values (`99222’, `E-101’, 93)
(32) ORACLE系统具有丰富的应用开发工具,若要进行数据库的模式设计,应选用_____。
A) Oracle Designer/2000 B) Oracle Developer/2000
C) Oracle Forms D) Oracle Graphics
(33) 软件生产的复杂性和高成本,使大型软件生产出现危机,下述哪个(些)是软件危机的主要表现_____。
Ⅰ. 需求增长难满足
Ⅱ. 生产成本过高
Ⅲ. 进度难以控制
Ⅳ. 质量不易保证
A) Ⅰ和ⅡB) ⅣC) Ⅱ和ⅢD) 全是
(34) 在面向数据流的软件设计方法中,一般将信息流分为_____。
A) 变换流和事务流B) 变换流和控制流
C) 事务流和控制流D) 数据流和控制流
(35) 软件需求说明书是软件需求分析阶段的重要文件,下述哪个(些)是其应包含的内容_____。
Ⅰ. 数据描述
Ⅱ. 功能描述
Ⅲ. 模块描述
Ⅳ. 性能描述
A) ⅡB) Ⅲ和ⅣC) Ⅰ、Ⅱ和ⅢD) Ⅰ、Ⅱ和Ⅳ
(36) 软件测试一般分为三类,即
Ⅰ. 静态测试
Ⅱ. 动态测试
Ⅲ. 正确性证明
设计测试实例对程序进行测试,应属于_____。
A) ⅠB) ⅡC) Ⅰ和ⅡD) Ⅲ
(37) 模块独立性是由内聚性和耦合性来度量的,其中内聚性是度量_____。(2分)
A) 模块间联系程度B) 模块的功能强度
C) 信息隐蔽程度D) 接口的复杂程度
(38) 软件设计中一般将用到图形工具,下述哪种(些)工具可用作设计的图形工具_____。(2分)
Ⅰ. 结构图
Ⅱ. 实体联系
Ⅲ. IPO图
Ⅳ. 层次图
A) Ⅰ和ⅡB) Ⅲ和ⅣC) Ⅰ、Ⅲ和ⅣD) 全部
(39) 试判断下列论述中哪个(些)是正确的_____。
Ⅰ. 软件系统中所有的信息流都可以认为是变换流
Ⅱ. 软件系统中所有的信息流都可以认为是事务流
Ⅲ. 事务分析和变换分析的设计步骤基本类似
A) ⅠB) ⅡC) ⅢD) Ⅰ和Ⅲ
(40) 软件的有效性测试是验证软件的运行是否达到用户的期望,用户的期望应体现于_____。(2分)
A) 详细设计报告B) 软件需求说明书
C) 总体设计报告D) 有效性测试要求
(41) 原型化是常用的一种软件开发方法,下述哪些是应用原型化方法的前提_____。
Ⅰ.严格定义软件需求是困难的
Ⅱ.有快速开发工具的支持
Ⅲ.可提供实际且可供用户参与的系统模型
A) ⅠB) ⅡC) ⅢD) Ⅱ和Ⅲ
(42) 根据Amdahl的定义,计算机体系结构反映的计算机属性是_____。
A) 概念性的结构B) 层次性的结构C) 模块性的结构D) 管理性的结构
(43) 把指令和数据分别进行存储的结构称为_____。
A) 冯.诺依曼结构B) 普林斯顿结构
C) 非冯.诺依曼结构D) 哈佛结构
(44) Intel CPU芯片的暂存机制是_____。
A) 累加器B) 累加器与通用寄存器
C) 堆栈D) 堆栈与通用寄存器
(45) 建立存储层次体系依据的原理是_____。
A) 性价比原理B) 总体成本原理
C) 局部性原理D) 全局性原理
(46) 目前使用最多的局部总线是_____。
A) ISA B) VESA C) EISA D) PCI
(47) 脉动阵列计算模式属于_____。
A) SISD B) MISD C) SIMD D) MIMD
(48) 运行相同的程序,计算机A需10秒,计算机B需15秒,其速度比较是_____。(2分)
A) A比B快50% B) A比B快30% C) B比A快50% D) B 比A快30%
(49) 在流水线计算机中,通过细化流水、提高主频,使每个机器周期能完成多个操作,该技术称为?_____。(2分)
A) 多流水技术B) 超标量技术
C) 超流水技术D) 超长指令字技术
(50) 主要用于测试处理器芯片的基准程序是_____。(2分)
A) Spec. B) Linpack C) Puzzle D) Quicksoft
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大学英语四级考试模拟试题
大学英语四级考试模拟试题
大学英语四级考试模拟试题 Model Test Five Part ⅠListening Comprehension Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. Choose the correct answer---A, B, C or D, and then, mark your answer by writing the corresponding letter on the Answer Sheet. Section A (C) 11. A) He will only be available in the afternoon. B) It’s not his office hour. C) He doesn’t have time. D) He is too tired after class. (A) 12. A) The woman insists on going out. B) The woman doesn’t like watching TV. C) The man promised her a gift on her birthday. D) The man is too tired to go out. (B) 13. A) There are too many courses offered to
2015英语专业四级考试听写模拟试题第1-10篇
第1篇 Teamwork Teamwork is just as important in science as it is on the playing field or in the gym. Scientific investigations are almost always carried out by teams of people working together. Ideas are shared, experiments are designed,data are analyzed, and results are evaluated and shared with other investigators. Group work is necessary, and is usually more productive than working alone. Several times throughout the year you may be asked to work with one or more of your classmates. Whatever the task your group is assigned, a few rules need to be followed to ensure a productive and successful experience. What comes first is to keep an open mind, because everyone's ideas deserve consideration and each group member can make his or her own contribution. Secondly, it makes a job easier to divide the group task among all group members. Thirdly, always worktogether, take turns, and encourage each other by listening, clarifying, and trusting one another. Mutual support and trust often make a great difference. Useful words and expressions: playing field n. 运动场 productive adj. 多产的，有生产价值的 productive force 生产力 productive labor 有价值的劳动 a productive farm 肥沃的农场 a productive writer 多产作家 investigation n. 调查，研究 (be) under investigation 在调查研究中 bear investigation 经得起考查，不怕追查 keep an open mind 不抱成见，抱着虚心态度 make a great difference 有很大差别，有很大影响 听力源文件下载地址：https://www.360docs.net/doc/bd18989270.html,/s/1i3iV5Tb
2019大学英语四级听力考试模拟试题(6)
2019大学英语四级听力考试模拟试题(6) 听录音把文中空白处补全 In many countries, authority is seldom questioned, either because it is highly respected, or because it is (1) _______. Sometimes, too, because (2) _______ has been important in certain societies for a long time, people have been trained never to question those in authority. In other countries, (3) _______America, children are trained to question and search for answers. When a child asks a question, he will be often told to go to the library and find the answer for himself. By the time students reach the age of 14 or 15, they may be (4) _______ exciting new ideas in all fields of science and the arts. To encourage such creativity, there are many national (5) _______ offered to students every year for their scientific discoveries and artistic (6) _______. This interest in questioning and searching may be (7) _______ by some people as bad for young people’s (8) _______, that young people lack respect for authority. (9) ___________________. However, this is because many Americans have different attitudes toward authority that may exist in other areas of the world. In a work or business situation, ideas are freely and openly discussed and argued. (10)_________________________. The two are quite separate. The purpose of the searching, questioning, and arguing is to find the facts in a particular situation, and therefore a solution, (11) ______________________________. 1.feared 2.rank
四级笔试新题型模拟题09
1.What are the two speakers talking about? A) How to keep healthy. B) How to calm our nerves. C) The benefits of exercise. D) The benefits of good sleep. 正确答案为C你没有作答。 解析： 音频中男士提到，锻炼可以带来很多好处（Exercise offers all the obvious benefits），女士对此进行了补充，可见两人是在谈论锻炼身体的益处，所以选C。 Script W: Professor Smith, what are your future projects on teaching? M: Later in the year I plan to revise my free Computer Basics course for the English majors at our college. 2.What is Professor Smith most likely to do later this year? A) Revise his Computer Basics course. B) Publish his third book on computer. C) Teach English majors American literature. D) Give a lecture to English majors at his college. 正确答案为A你没有作答。 解析： 音频中男士提到，他今年晚些时候计划修改计算机基础课程（I plan to revise my free Computer Basics course），所以选A。 Script W: What information or advice can you offer to our home users of this software? M: Just spend some time now and then exploring your software. I guarantee you'll learn something and you might even have fun! 3.Who is the woman probably speaking to? A) A film producer. B) A software designer. C) A newspaper reporter. D) A home user of that software. 正确答案为B你没有作答。
大学英语四级考试模拟试卷及参考答案(第一套)
大学英语四级考试模拟试卷及参考答案(第 一套） Part II Reading Comprehension (35 minutes) Directions: There are 4 reading passages in this part. Each passage is foll owed by some questions or unfinished statements. For each of them there are fou r choices marked A), B), C) and D). You should decide on the best choice and ma rk the corresponding letter on the Answer Sheet with a single line through the center. Passage One Questions 21 to 25 are based on the following passage. There is a difference between science and technology. Science is a method o f answering theoretical questions; technology is a method of solving practical problems. Science has to do with discovering the facts and relationships betwee n observable phenomena in nature and with establishing theories that serve to o rganize these facts and relationships; technology has to do with tools, techniq ues, and procedures for implementing the finding of science. Another distinction between science and technology has to do with the progr ess in each. Progress in science excludes the human factor. Scientists, who seek to comp rehend the universe and know the truth within the highest degree of accuracy an d certainty, cannot pay attention to their own or other people's likes or disli kes or to popular ideas about the fitness of things. What scientists discover m ay shock or anger people-as did Darwin's theory of evolution. But even an unple asant truth is more than likely to be useful; besides, we have the choice of re fusing to believe it! But hardly so with technology; we do not have the choice
大学英语四级考试模拟新试题2
大学英语四级考试模拟新试题2 Part ⅠWriting 第1题： For this part, you are allowed 30 minutes to write a short essay based on the picture below. You should start your essay with a brief account of cases of excessive or unnecessary tests prescribed by some doctors and then explain the reasons and consequences of those irresponsible practices in some hospitals and make your suggestions about it . You should write at least 120 words but no more than 180 words. 参考答案： [参考范文] "You"re in excellent health. I"ll need to run some tests until I find something wrong with you." The caption in the picture reveals an embarrassing fact that patients have to go through many unnecessary tests such as X-rays and ultrasound scan prescribed by the doctor and pay the expensive bills when going to hospital. It"s unbelievable that some doctors should do such things. Regarded as angels who save the wounded and rescue the dying, some doctors only want to earn money in reality. Prescribing many tests for patients is the best way to achieve their goals. As a result, with a surge in medical disputes, conflicts between doctors and patients are increasingly intensified to an unprecedented degree. In my opinion, the government should take measures to tackle this issue. Firstly, the government should regulate and supervise the price of medical examinations and drugs. Secondly, an inspection mechanism should be established to monitor hospitals. Only when the problem of excessive medical tests is solved can doctor-patient relationship be improved. 详细解答： Part ⅡListening Comprehension Section A [听力原文] 听力原文：Rising levels of obesity and unhealthy weights could be linked to 670,000 extra cases of cancer in the next 20 years, a UK report predicts. If current trends continue, experts say, almost three in four adults could be overweight or obese by 2035, bringing a host of health issues. Their work suggests a rise in the number of people who are overweight or obese would contribute to 4.6 million additional cases of type-2 diabetes and 1.6 million extra cases of heart disease by 2035. The report recommends a number of ways to tackle this problem, including introducing a 20 pence per litre tax on sugary drinks and a review of how food is advertised online. Department of Health officials said they had already brought in a ban on adverts featuring junk food during children′s TV programmes and would be launching a childhood obesity strategy shortly.
2013年12月大学英语四级(CET4)考试样卷(改革后新题型)
2013年12月大学英语四级(CET4)考试样卷 Part I Writing (30 minutes) Directions:For this part, you are allowed 30 minutes to write an essay. You should start your essay with a brief description of the picture and then express your views on the importance of learning basic skills. You should write at least 120 words but no more than 180 words. Write your essay on Answer Sheet 1. 注意：此部分试题请在答题卡1上作答。 PartII Listening Comprehension (30 minutes) Section A Directions:In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. 注意：此部分试题请在答题卡1上作答。 1. A) The man has left a good impression on her family. B) The man’s jeans and T-shirts are stylish. C) The man should buy himself a new suit. D) The man can dress casually for the occasion. 2. A) Its price. C) Its location. B) Its comfort. D) Its facilities. 3. A) It is a routine offer. C) It is new on the menu. B) It is quite healthy. D) It is a good bargain. 4. A) Read the notice on the window. C) Go and ask the staff. B) Board the bus to Cleveland. D) Get a new bus schedule. 5. A) He is ashamed of his present condition. B) He is careless about his appearance. C) He changes jobs frequently. D) He shaves every other day.