甘肃电大2020年春季计算机科学与技术专业(本科)入学水平测试卷

甘肃广播电视大学2020年春季

计算机科学与技术专业(本科)入学水平测试卷

说明：本试卷总分100分，其中电路基础及数字电路部分占30%，电大英语(2)占30%，程序设计部分占40%。

第一部分：数字电子电路基础(共30分)

1.当环境温度升高时，晶体二极管的反向电流将( )

A.增大 B. 减小 C 不变

2.如图所示电路中，电阻R 两端电压及消耗的功率为( )。

A.2V，2W

B.2V，4W

C.1V，2W

D.1V，4W

3.某二极管反向击穿电压为140V，则它的最高反向工作电压为( )

A.3V B. -3V C.6V D. -6V

4.用万用表不同欧姆档测量二极管的正向电阻值时，测得的阻值不相同，其原因是( )

A.二极管的质量差

B.万用表不同欧姆档有不同的内阻

C.二极管有非线性的伏安特性

5.逻辑电路如图所示，其输出端F的逻辑函数表达式为( )。

二、电路设计题(共12分)

有三盏电灯，想把它们连接在一个电路中，要求用不同的每盏电灯都不影响别的电灯。请你设计出这个电路，并画出电路图。

第二部分：英语(共30分)

三、单项选择题(每题2分，共20分)

1. This class ________ now. Miss Gao teaches them。

A. are studying B. is studying

C. be studying D. studying

2. We will have a _________ holiday after the exam。

A. two month B. two-month

C. two month’s D. two-months

3. There is no enough ________ on the corner to put the table。

A. place B. room C. floor D. ground

4. We can have _____ blue sky if we create _____ less polluted world。

A. the a B. a the C. a a D. the the

5. There are many trees on ________ side of the street。

A. either B. any C. all D. both

6. He didn’t hear from his friend __________ last month。

A. since B. by the end of C. for D. until

7. – Which book would you like to borrow? -- ________ of the two books is OK with me。

A. Either B. Both C. Any D. None

8. You’ve passed the exam. I’m happy ______ you。

A. on B. at C. in D. for

9. The pen _________ him ten yuan。

A. paid B. cost C. took D. spent

10. He _________ his bike so he has to walk there。

A. lost B. has lost C. had lost D. loses

四、阅读下列短文,从每题的A, B, C, D四个选项中选择一个正确答案。(每题4分，共20分)

People have sailed around the world in quite small boats. It is not an easy thing to do. Sometimes the weather gets bad. That can be the end of a boat, and the end of everyone in it. Accidents can happen easily and quickly.

One family had an accident with some big fish. (Perhaps it wasn’t an accident for the fish.) The swam under their boat and bit holes in it. Theses came in, of course; and they all got into that. They lived and hoped for many days. They ate and slept, and they always hoped. At last a ship found them.

How do people live in a very small life-boat? Perhaps for weeks or months? They must be strong in every way. They must have hope—they must want to live. But you cannot eat and drink hope.

You cannot drink sea water. Drink a lot of sea water and you will quickly die. Sailors can drink rain water. They must catch rain water in their boat. They must also catch fish and birds for food. Life-boats do not often carry a cooker, and so the sailors can not cook their food. Raw fish and bird-meat is not very nice. But there won’t be any choices in a life-boat! The sailors must eat raw food or they will die.

What do people think about in a life-boat? They think about land, a warm bed, dry clothes, fresh water and food, food, food.

( ) 1. Which of the following is not correct?

A. Life-boats often carry a cooker.

B. People cannot drink sea water.

C. Life-boats are usually light and small.

D. People may have to live for weeks on a life-boat

( ) 2. The family’s accident was caused by _________ .

A. the weather B. the wind C. rain D. a fish

( ) 3. Which of the following is correct?

A. The family were killed by the fish B. The family lost their hope

C. A ship saved the family D. The boat sent them to bank

( ) 4. You can _______ meat in a life-boat.

A. cook B. not cook C. not eat D. not carry

( ) 5. When they are in trouble in the sea, people most probably always think about _______ .

A. sea water B. accidents C. rough sea D. none of these

第三部分：程序设计部分(共40分)

五、填空题：(每题3分，共15分)

1.一个算法的优劣可以用 与 来衡量。

2.同一数组中的所有元素必须属于 数据类型。

3.下列各步骤的先后顺序是 。

①调试程序 ②分析问题 ③设计算法 ④编写程序。

4.逻辑表达式a>b||b= =5的相反表达式为__________________。

5.三种基本的程序结构为             、             、             。

六、是非题(正确的在题后括号内打“√”，错的打“×”，每题3分，共15分)

1.好的程序设计风格包括给变量、常量命名时要见名知意。( )

2.整型和长整型的区别在于前者取值范围更大。( )

3.一个算法只能用一种程序设计语言来实现。( )

4.计算机是人制造的，所以，它和人脑解决问题没有什么区别。( )

5.建立计算模型的目的是为了使问题的计算复杂性分析有一个共同的客观尺度。( )

七、算法设计题：(共10分)

设计一个算法求“闰年问题”。 (提示：能被4整除但不能被100整除或能被400整除的数为闰年。)