对于小型的塑件常采用嵌入式多型腔组合凹模，各单个凹模常采用机械加工、（）、抛光或热处理等方法制成，然后整体嵌入模板中。
参考答案：研磨
根据句意填空
1. she’s my s______Mary.
2. This is a p______of my family.
3. I l______my mother very much.
4. She is my pen f______ Emma.
5. My father’s brother is my u_____.
6. My mother’s sister is my a______.
7. T______ are his brothers.
8. Thank you very m______.
9. S_____is my sister ,Jill.
10. —Is Lucy your d______?
— Yes ,she is .
如果焊接缺陷产生在结构的应力集中区，则其对脆断的影响是不大的。（）
