13. Which word of the following describes all languages?  A) Systematic.

7．调节阀的理想流量特性有（    ）。（ 多选题 ）A. 直线型     B. Y 型 C. 等百分比型    D. x型   E. 快开型

8．下列常用控制规律中哪几个属于有差控制？（  ）（多选题） A. PB.PI  C.PD D.PID

6. What do we learn from the first paragraph about the self-help industry? A) It

12. According to the first paragraph an American student is allowed _____  A)to

2. What is the function of eyewitness testimony?A)It can be relied on to detect

2. He said that I had stolen his bicycle, but I ______ it.A) denied

18. How will beautiful rooms influence visitors at an exhibition?A) They will ma

6．控制系统中，调节器的积分时间越小，则（    ）。（ 多选题 ）A. 余差越小    B. 积分作用越弱C. 积分作用越强  D. 余差越大  E. 过渡过

64. 周教授一生都致力于语言教学事业。（be committed to）

34. Government officials visited the flood area on Thursday morning to _______th

下列流量计中哪一个最适合小流量、小管经的流量测量？（  ）A. 差压流量计B. 转子流量计 C. 椭齿流量计D. 漩涡流量计

15. It is not _______ he said but______ he did that really mattered to us.  A) w

Which of the following statements about Michael Lee’s parents is true?A) His fat

3．判断下图为调节系统在阶跃干扰作用下的过渡形式（  ）。A.非周期衰减过程  B.衰减振荡过程    C.等幅振荡过程   D.发散振荡过程

判断下图为调节系统在阶跃干扰作用下的过渡形式（  ）。A. 衰减振荡过程  B. 非周期衰减过程C. 等幅振荡过程  D. 发散振荡过程

15.Which babies have trouble in learning to speak?A) Some severely retarded chil

40. Farmers will have a good harvest, _______ that the weather is favorable.A) a

2. What should parents do in order to help their children succeed?A) They should

一种前馈控制系统能克服   种干扰；反馈控制系统能克服    干扰。

16. What should you do when you need to answer a phone call during a performance

5. I think they punished the criminal too ________.  A) heavily            B) sh

4. — I’d like to talk to Professor Li, please.  — ____________   A. Oh, you have

20. Which of the following is TRUE according to the passage?　　A) You should limi

2．确定最合适的P、I、D，对于单回路的简单控制系统，一般希望过渡过程的衰减比数值为       的衰减振荡过程。