下列有关空气成分的说法，不正确的是[ ] A.氮气的化学性质不活

搜题请搜索小程序“爱下问搜题”

问题选择题

下列有关空气成分的说法，不正确的是[ ]

A.氮气的化学性质不活泼，可在食品包装时充入防腐

B.氧气的化学性质比较活泼，能够燃烧

C. “干冰”升华能吸热，因此能用于人工降雨

D.稀有气体化学性质不活泼，但也能与一些物质发生化学反应

答案

答案：B

填空题

根据句意和首字母提示补全单词。

1. Danny fell on top of Brian and Brian was i_____.

2. Our school has just worked out a new s_____ rule.

3. Mary just has a cold. Nothing s_____.

4. You must be more c_____ when you cross the road.

5. I'm not m_____ at you.

6. The a_____ happened at about 7:30 am.

7. I didn't go to bed until my mother r_____ last night.

8. After the accident, the driver called an a_____.

9. I wanted to s_____her from running after the ball.

10. A w_____ to the accident was walking behind the two students.

单项选择题

某一监理合同，工程为2002年6月开工，工程代号为08，则该监理合同文件名可以用下列( )表示。

A．HTJ020608

B．HTJ080206

C．JHT020608

D．JHT080206