凹模是下模，压料圈和凸模是上模，利用双动压床的外滑块固定压料圈，内滑块固定凸模，从而使坯料拉深成型所使用的模具就叫双动拉延模。
参考答案：对
用所给词的适当形式填空。
1. I don't have much time (play) with my friend.
2. Thank you very much for (write) to me.
3. Every day Millie spends half an hour (study) English.
4. Lily always helps her mother (clean) the house.
5. Daniel (not want) a new computer.
免疫抑制药能抑制（）
A.粒细胞功能
B.巨噬细胞吞噬功能
C.血小板聚集功能
D.抗体的产生
E.T淋巴细胞生成白介素-2
