按如图装置进行实验，先放在黑暗环境中一昼夜，然后再移到阳光下照射． （1）几小

单词拼写。

1. I keep my reference books near my desk for c_______.

2. Children wearing school u_______ look much smarter.

3. We were t_______ to hear your wonderful news.

4. This is a c_______ of Tang-song poems, which I like very much.

5. It is clear that her painting has been i_______ by Picasso.

6. The May 4th M_______ of 1919 is very important in the history of China.

7. Einstein put forward his t_______ of relativity in 1905, which has had great influence on the world.

8. Have they a _______ when the race will begin?

9. A_______ from your spelling, your composition is rather good.

10. He drew a c_______ after a lot of experiments.

设N_A为阿伏伽德罗常数，下列叙述正确的是（　　）

A．24g镁原子的最外层电子数为N_A

B．1L0.1mol•L^-1乙酸溶液中H⁺数为0.1N_A

C．1mol甲烷分子所含质子数为10N_A

D．标准状况下，22.4L己烯的分子数为N_A

对于饱和蒸气进料，进料线(q线)方程的斜率( )。

A．)＞0

钢水吹氩搅拌的目的？

侦查工作的原则是什么