石油中的酸性氧化物总称（），其中环烷酸含量占总酸量的（）。

损伤的并发症主要有（）

A.溃疡

B.窦道

C.瘘管

D.坏疽

E.以上都是

用所给动词的适当形式填空。

1. Mr Hunt _____ (leave) for New York next Monday.

2. —Where is Mrs Read?

    —She _____ (borrow) some books in the library.

3. Our headmaster _____ (come) back in three days.

4. —Supper is ready, Li Lei.

   —Yes, I _____ (come).

5. They will go to the zoo if it _____ (not rain).

6. —Don't forget to write to me.

    —I _____ (write) to you as soon as I arrive in New York.

7. Tom _____ (do) his homework, isn't he?

8. Look! The twins _____ (wear) new clothes.

9. Mr Read _____ (clean) the windows once a week.

10. Why not _____ (go) to Beijing tomorrow?

景别有哪些（）

A.特写

B.近景

C.远景

D.大景

下面关于除尘器说法不正确的是（）。

A.惯性除尘器适于捕捉10～20μm以上的粗尘粒

B.电除尘器对细粉尘捕集效率可高于99%

C.袋式除尘器的工作原理是过滤

D.旋风洗涤器适用于处理烟气量小和含尘浓度低的场合