【判断题】16. 词语ئۈنۈم中的两个ئۈ 用的书写形式不同。（)

A、初速度为零的点电荷置于静电场中，将一定沿一条电场线运动

B、带负电的点电荷，在电场中从a点移到b点，若电场力作正功，则a、b两点的电势关系为Ua>Ub

C、由点电荷电势公式可知，当r→0时，则U→

D、在点电荷的电场中，离场源电荷越远的点，其电势越低

E、在点电荷的电场中，离场源电荷越远的点，电场强度的量值就越小

【简答题】16-2-6）图16.8示电路中,已知二端口的参数矩阵为,试求为何值时能获得最大功率，并求此最大功率。

【简答题】16-2-4）图16.6示电路中,Ω，回转器电阻Ω，Ω，求端口输入电阻。

【填空题】AV Clip 16: Smoking and Mental DeclineAV 16 Smoking & Mental Decline.avi Watch the video clip three times and complete the following passage by filling in each blank with the word from the video clip. Cigarette smoking has long been associated with many serious health risks, including (1)______________ disease, stroke and cancer. Now new research shows that cigarette smoking may also be (2)________ to increase mental decline with age. Researchers from National Institute for Public Health and (3)____________ in the Netherland studied nearly 2,000 men and women aged 43 to 70 years. They gave (4)___________ cognitive tests, once at the beginning of the study, and then again five years later. The result shows that mental decline among smokers was 1.9 times greater for (5)__________ function, 2.4 times greater for mental (6)__________ and 1.7 times greater for overall cognitive ability. In the U.S., nearly 25% men and 18% women are still smokers. The researchers suggest that smokers who (7)________ their habit at any age may be able to postpone the (8)________ of cognitive decline as they grow older.

【单选题】

A、5

B、24

C、16

D、2

【单选题】在单因子方差分析中,因子有4个水平,每个水平下各重复3次试验,现已求得每个水平下试验结果的样本标准差分别为1、2、1、4,则误差平方和为( )

A、8

B、16

C、22

D、44

【填空题】Task Audio-visual Exercises AV Clip 16 Mental ResilienceAV 16 Mental Resilience.avi Watch the video clip “Mental Resilience” and complete the following statements with the information from the video. 1. The mental resilience is an ability to keep , and then to learn and afterward. 2. According to Dr. Mark Servis, mental resilience is the ability to adapt to . 3. In Parker’s eyes, the mental resilience “should be mental . Because you come to a point in your life it's not . I guess it is optional in how you are going to it.” 4. Dr. Servis finds that there are that make people mentally flexible in the face of obstacles, the first being . 5. Dr. Servis said that people who have a very positive sense of self, who feel good about themselves and have generally good self-esteem, fare much better in dealing with than individuals with . 6. Self-esteem has helped people stay mentally resilient through the ages. Another common thread, an in the face of tragedy. 7. Tracee didn’t give up and she said that main thing that got her through the ordeal was her . She said: “Once you understand that there is something greater than yourself. And you have to let yourself go and … and practice it.” 8. This type of outlook is another characteristic that experts have identified as . 9. A and the ability help build mental resilience. You do not view yourself as a victim in difficult situations, but rather as in your own destiny. 10. According to Dr. Servis, an internal locus of control was associated with individuals who . An internal locus of control simply means that the individual feels . They're in charge of what happens in their life. 11. Experts say it's never too late to start building your mental resilience. You can do that by learning , and as we’ve witnessed in the United States, by finding during difficult times.

【简答题】16-2-2）求图16.4示二端口电路的参数矩阵。

【简答题】16-2-1）求图16.3示二端口电路的参数矩阵。

A、1

B、2

C、3

D、4