问题
单项选择题 A1/A2型题
生物安全柜主要原理（）。
A.空气经滤膜除菌后定向流动
B.干燥
C.空气定向流动
D.通风
E.防潮
答案
参考答案：A
解析：生物安全柜中空气经滤膜除菌后定向流动，不会沉降。
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生物安全柜主要原理（）。
A.空气经滤膜除菌后定向流动
B.干燥
C.空气定向流动
D.通风
E.防潮
参考答案：A
解析：生物安全柜中空气经滤膜除菌后定向流动，不会沉降。
| 补全对话。 | |
| M-Mother; J-Jane M: Jane! Jane! It's time to get up. J: 1 M: It's 7:30. J: 2 M: Don't worry, Jane. You can go to school with your father. J: 3 M: He often goes to work by bus. But he is going to work by car today. J: Car? Oh, I almost forget. 4 M: So you can go to school by car today! J: 5
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