若n表示问题的规模、O(f(n))表示算法的时间复杂度随n变化的增长趋势，则算法时间

作图题

（1）过点P作直线l的垂线PO，垂足为O； 

（2）连接PA、PB；  

（3）比较线段PO、PA、PB的长短，并按从小到大的顺序排列.

You can _____ the book from the library.

[      ]

A. keep

B. lend

C. borrow

D. keeping

Dr. Kate: Radio _小题1:  (change) a lot since we were young. It used _ 小题2: be the major source of' fun for the family.

Bob:      Nowadays when you turn on the radio, you either hear music, a talk show小题3: news.

Dr. Kate: 小题4:  (Fortunate), you can choose the kind of music you want to hear.

Bob:      Yes, and there is a lot of points of view when you listen to talk shows. I usually enjoy  小题5:  (listen) to them. I particularly like it w-hen a caller disagrees with the talk show host. I like to hear how he will defend his ideas.

Dr. Kate: Some talk show hosts are very rude to those  小题6: have opposing ideas. I really find that terrible.

Bob:     It seems that people only listen to the radi0  小题7:  they are driving in their car ，

Dr. Kate: That is true for me. but I know that my husband listens to it while he is working  小题8: home.

Bob:   Now that f think about it, I realize that a lot of stores have the radi0  小题9:  (play).

Dr. Kate: It's still a usefully and pleasant form of  小题10: (communicate).

柴油机喷油泵的调试是通过测量（）进行的。

A、扬程 

B、流速 

C、油量 

D、输送速度

流行病学任务的三个阶段是（）

A.观察性研究、实验性研究和理论性研究

B.揭示现象、找出原因和提供措施

C.描述分布、提出假设和验证假设

D.整理资料、分析资料和得出结论

E.早期发现、早期诊断和早期恰当治疗