问题 问答题 简答题

用天平的原则是什么?

答案

参考答案:

不能使天平超载,以免损毁天平。不应使用精度不够的天平,那样会达不到测定要求的精度。也不应滥用高精度天平造成不必要的浪费。

阅读理解

阅读理解。

        Shlander is a man from space. He thinks the people and things on the earth are very strange. He is now writing a letter to his friend at home. Here is part of his letter. Read it and answer the questions.

     Now I am in a strange world. It is very nice. There are many new things here. There are many earth monsters (怪物 ) here,  too. The earth monsters look very funny. They have just one head, two arms and two legs. They have thin black strings(细绳) on their heads. Some earth monsters have brown or yellow strings. The earth monsters have a hole in their faces. Every day, they put nice things and balls from the trees into the hole. They put water into the hole, too. The earth monsters do not walk very fast. They move from place to place in tin boxes.

      At night, the earth monsters like to look at a square window box. This box has very small earth monsters in it.

1. Shlander thinks the people and things on the earth are very _________.

A. strange              

B. nice

C. different            

D. beautiful

2. Shlander thinks man on the earth is  

A. a monkey          

B. an earth monster

C. a tin box            

D. a strange world

3. The earth monster doesn't have ___________.  

A. a head, arms and legs

B. brown or yellow strings on its head

C. a hole in its face

D. a wing on its body  

4. The earth monsters don't put into their holes. 

A. nice things          

B. balls

C. fire                    

D. water

5. The square window box is __________.

A. a car or a bus

B. a very small earth monster

C. a TV set

D. a radio

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