问题 实验题

下图为一正在测量中的多用电表表盘

(1)如果是用×10 Ω挡测量电阻,则读数为­­        Ω.

(2)如果是用直流10 mA挡测量电流,则读数为       mA.

(3)如果是用直流5 V挡测量电压,则读数为         V.

答案

60        7.2       3.60

题目分析:电阻×10档读第一行,测量值等于表盘上读数乘以倍率“10”;直流电流10mA档读第二行“0~10”一排,最小度值为0.2mA估读到0.1mA就可以了;直流电压5V档读第二行“0~50”一排,最小分度值为1V估读到0.1V就可以,最后结果×

(1)用×10Ω档测量电阻,指示值6.0Ω,倍率为×10,读数为60Ω.

(3)用直流10mA档测量电流,读数为7.2mA.

(2)用直流5V档测量电压,读数为3.60V.

点评:最小度值为1、0.1、0.01的估读到下一位,最小度值为2、0.2、0.02的估读半格,读到同位,最小度值为5、0.5、0.05的估读到本位。

阅读理解

阅读理解

editor,

     You can find language pollution whenever you open a newspaper or turn on your TV set, listen to a

popular song at various advertisements. Language pollution exists almost everywhere and can be seen in

the following places:

     1. Chinese characters are written in the complex (复杂的 ) form. Although simplified Chinese

characters were accepted for use many years ago, it seems that more and more people like Chinese

characters written in the complex form.

     2. Many goods are produced in China but carry foreign names, which sound strange and have no

meaning at all.

     3. Words and expressions being used have a bad meaning. "Ba"(霸), which means bully in Chinese,

is one example. Now there are a lot of goods, restaurants, even factories or firms, with "Ba" in their

names.

     4. There are too many incorrect grammatical expressions. Some films have strange names and

incorrect grammatical structures. "Ai ni mei shang liang', which means "I love you without consulting",

is grammatically incorrect and this kind of expression is now becoming popular.

      Some language experts point out that language pollution must be done away with, which is an idea

shared by myself and many others.        

                                                                                                     Fan Yongqian

1. The writer of the letter suggests that ______.

A. something be done to make our language pure (纯正)    

B. the Chinese language not have the word "ba"    

C. everything have a good name and a good meaning    

D. everybody try their best to stop pollution

2. What the writer wants to say is that ____.

A. great difference exists between the Chinese characters written in the complex form and

     simplified form    

B. many people agree with the experts on language pollution in China    

C. our newspapers, TV programs, pop songs and advertisements are getting polluted    

D. some film writers haven't studied Chinese grammar

3. The expression "do away with" in the last paragraph means "_______".

A. clean        

B. recycle        

C. get away            

D. end

4. What do you guess Fan Yongqian is? He or she probably is _____.

A. a reader    

B. a singer of pop songs  

C. a language expert  

D. an expert of grammar

问答题