塑料的改性方法有哪些？
参考答案：
塑料的改性方法有：
增强改性；
填充改性
共聚改性
低发泡改性
电镀改性
聪明的你，看图选选看！
1. — How many rooms can you see? — I can see ____________.
A. four
B. five
C. three
2. — Who is in the living room? — He's ____________.
A. father
B. mother
C. Father Christmas
3. — Where is the puppy? — It's in the ____________.
A. bathroom
B. kitchen
C. study
( )是划分阶级的依据。
A．人数
B．收入
C．权利
D．对生产资料的占有关系
