接收机中AGC信号是()A、中频信号B、音频信号C、谐波信号D、直流分量

题型:单项选择题

问题:

接收机中AGC信号是()

A、中频信号

B、音频信号

C、谐波信号

D、直流分量

考点:电子产品维修工LD、VCD、DVD视盘机LD、VCD、DVD视盘机题库
题型:单项选择题

阅读理解。

                                                                     TYPING

     This course(课程) is for those who want to learn to type ,as well as those who want to improve

their typing. The course is not common. You are tested in the first class and begin practising at one of

eight different skill levels(水平). This allows you to learn at your own speed. Each program lasts 20

hours. Bring your own paper.

     Course fee(费用): $125     Materials: $25

     Two hours each evening for two weeks. New classes begin every two weeks.

     This course is taught by a number of professional business education teachers who have successfully

taught typing courses before.

                                           UNDERSTANDING COMPUTERS

     This twelve - hour course is for people who do not know very much about computers, but who need

to learn about them. You will learn what computers are, what they can and can't do and how to use them.

     Course fee: $75  Jan. 4,7,11,14,18  Wed.& Sat. 9:00-11:30a. m.   Equipment fee: $10

     David is a professor(教授) of Computer Science at Beijing University. He has over twenty years of

experience in the computer field.

                                                           STOP SMOKING

     Do you want to stop smoking? Have you already tried to stop and failed? Now is the time to stop

smoking using the latest methods (方法). You can stop smoking, and this twelve -hour course will help

you do it.

     Course fee: $30    Jan. 2,9,16,23     Mon. 2:00-5:00p. m.

     Dr John is a practising psychologist who has helped hundreds of people stop smoking.

1. If you choose the UNDERSTANDING COMPUTERS course, you will have classes_____.

A. from Monday to Sunday    

B. from Monday to Friday

C. on Wednesday and Saturday      

D. on Saturday and Sunday

2. The STOP SMOKING course will last_____.

A. for half a day          

B. for three hours    

C. for a week            

D. for four weeks

3. Mr. Black works every morning and evening, but he wants to take part in one of the three courses.

Your suggestion is_____.

A. TYPING                  

B. UNDERSTANDING COMPUTERS

C. STOP SMOKING              

D. all the courses

4. If you want to learn about computers and at the same time you want to improve your typing, you

will pay_____.

A.  $75        

B.  $150      

C.  $115            

D.  $235

5. The special difference between the TYPING course and the other two is_____.

A. people with different skill levels may learn at different speed

B. you will take a test after the course

C. you will pay the fee before practising

D. you will pay less money

题型:单项选择题

13岁男孩,反复上腹部疼痛2年,伴恶心、反酸,上腹部压痛。

下列哪种情况提示患儿为十二指肠溃疡()

A.疼痛位于剑突下偏左

B.压痛点局限

C.呕吐宿食

D.空腹痛

E.情绪波动诱发

题型:单项选择题

关于GFP的说法,以下错误的是()。

A、可以在字节同步的链路中传送长度可变的数据包

B、可以传送固定长度的数据块

C、采用了与ATM技术完全不同的帧定界方式

D、采用不同的业务数据封装方法对不同的业务数据进行封装

题型:单项选择题

它是国民经济的命脉,任何跨越空间的物质实体的流动,都可称为()。

A.仓储

B.配送

C.运输

D.流通加工

题型:单项选择题

熨烫长毛绒面料时,应在()上烫。

A.正面

B.正反面

C.反面

D.正面或反面

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