气雾剂按分散系统可分为哪几类？
参考答案：
按分散系统，气雾剂可分为溶液型气雾剂、混悬型气雾剂和乳剂型气雾剂。
根据图画和句意填单词。
1. -What’s this in ______________?
-It’s a _________________.
-How can you ______________ it?
-B-A-C-K-P-A-C-K.
2. I like watching ____________ games.
3. I don’t know the word. I need an English d .
4. Please write them down in you n .
5. A __________ can tell（告诉）us the time（时间）.
6. -Is this your _________ _________?
-Yes, it is. Thank you.
7. This is the __________ to the door（门）. Let’s go in.
真分数就是最简分数。[ ]
