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问题 多项选择题

改变矿井的风阻特性的方法有（）。

A.改变巷道断面

B.调节闸门

C.降阻调节

D.增阻调节

答案

参考答案：A, B, C, D

单项选择题

《危险废物(含医疗废物)焚烧处置设施二恶英排放监测技术规范》规定，危险废物和医疗废物焚烧设施在运行期间，每年应至少对焚烧设施进行( )二恶英排放的监督性监测。

A．一次

B．二次

C．三次

D．四次
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补全对话，情景问答
从方框中选择适当的句子补全对话。
A. No.
B. Yes, I do.
C. No, I didn't.
D. About eight hours.
E. How often do you eat fruit
    and vegetables?
F. Because the doctor tells me
    that it isn't good for my health.
G. Yes, please.
A: Excuse me, may I ask you some questions?
B: Certainly.
A:     1   
B: I eat them every day.
A: Do you like them?
B:    2    But the doctor says they're good for my health.
A: Do you like junk food?
B:    3     But I try to eat it only once a week.
A: Why?
B:     4   
A: How many hours do you sleep every night?
B:.   5     
A: Oh, I think you must be in good health.
1._____2._____3._____4._____5.______
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