塑料着色时，对着色剂有哪些要求？
参考答案：
对着色剂的要求是分散性好、耐热性好、有一定的耐候性和耐光性、相容性好。
用所给词的适当形式填空。
1. How many _______ (student) are there in your class?
2. Have you _______ (get) any aunts?
3. My father's got a brother, but my mother __________ (not have got) a brother.
4. There are four people in my family－my father and mother, my sister and _______ (I ).
5. We have got 24 _______ (classroom) in the building.
我国中部的安徽、湖北、河南、江苏等省的部分地区属疫情不稳定地区的主要传播媒介是（），（）
