简述生物安全柜的基本结构。
参考答案:
生物安全柜一般均由箱体和支架两部分组成。箱体包括空气过滤系统、外排风箱系统、前玻璃门驱动系统、紫外光源、照明光源和控制面板等。
第Ⅱ卷(非选择题,共46分)
III.单词拼写(10分)
1. How much do you _________(要价) for mending shoes? 1.__________
2. If she _______(继续) drinking like that, I’ll have to carry her home. 2. __________
3. The car couldn’t start because the _______(发动机)went wrong. 3.___________
4. It is _________(极其) cold in the South Pole. 4. __________
5. The teacher walked the children out of the ________(幼儿园). 5. __________
6. I have _________(后悔) not having studied hard. 6.___________
7. The newspaper described her as a ______(有前途的) young pianist. 7. __________
8. The girl was so angry that she __________(撕) the letter into pieces. 8. __________
9. He started his first _______(航海)with only one ship and ten men. 9. ___________
10. I felt a _________(急剧的) pain in my stomach. 10. _________