一根钢棒很难被压缩，也很难被拉伸，是因为分子间存在着______．

搜题请搜索小程序“爱下问搜题”

问题填空题

答案

钢棒很难被压缩是因为分子间存在着斥力；很难被拉伸是因为分子间存在着引力．

故答案为：斥力和引力．

阅读理解

阅读理解。

This is a Chinese boy. His name is Wu Yonghua. He is twelve. He is in No. 8 Middle School. He's in

Class Three, Grade Two. His English teacher is Mr. Liu. His Chinese teacher is Mr. Zhu. Bob is an

English boy. He's in No. 8 Middle School, too. His English teacher is Miss Wang. His Chinese teacher is

Mrs. Fang. Wu Yonghua and Bob are Number 5. They are good friends.

1. Wu Yonghua is _____ boy.

A. an American

B. a Chinese

C. an English

D. a Japanese

2. How old is Wu Yonghua? _____.

A. He's 10

B. He's 11

C. She's 12

D. He's 12

3. Bob is _____ boy.

A. a Chinese

B. an English

C. an American

D. a Japanese

4. How old is Bob? _____.

A. He's 12

B. She's 12

C. He's 13

D. We don't know

5. Which is not right(正确)?

A. Mr. Zhu is Bob's English teacher.

B. Mrs. Fang is Wu Yonghua's Chinese teacher.

C. Bob is Wu Yonghua's friend

D. A and B

判断题

交流电只能由交流发电机产生。