问题
单项选择题
车用直流发电机须用三联调节器，它由断流器、节流器和节压器组成，断流器的作用是（）。
A.防止蓄电池输出电流流入发电机，将发电机烧坏
B.使发电机输出电流不超过允许值，防止烧坏电枢线圈
C.使发电机电压不超过允许值，防止烧坏电器设备
D.防止发电机输出电流倒流入蓄电池，将蓄电池烧坏
答案
参考答案：A
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车用直流发电机须用三联调节器，它由断流器、节流器和节压器组成，断流器的作用是（）。
A.防止蓄电池输出电流流入发电机，将发电机烧坏
B.使发电机输出电流不超过允许值，防止烧坏电枢线圈
C.使发电机电压不超过允许值，防止烧坏电器设备
D.防止发电机输出电流倒流入蓄电池，将蓄电池烧坏
参考答案：A
| 阅读理解。 | |||||||||||||||||||||||||||
| Stress (压力) is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are:death, diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on. How do you know whether you have stress? Could you give your answers to the following questions?
what can you do about it? Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving (减轻) stress. However, doctors now say that there are easier ways-people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress. | |||||||||||||||||||||||||||
| 1. Who has got stress in everyday life? | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. Men and women. B. Young people. C. Both A and B. | |||||||||||||||||||||||||||
| 2. If you have over problems listed in the table, you are the person with stress. | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. two B. three C. eight | |||||||||||||||||||||||||||
| 3. Which of the followings is NOT the reason of stress? | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. Taking exams. B. Taking sleeping pills. C. Making money. | |||||||||||||||||||||||||||
| 4. What's the easier way to relax your body? | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. Talking with friends. B. Doing relaxing exercises. C. Laughing, smiling and crying. | |||||||||||||||||||||||||||
| 5. The main idea of the passage is . | |||||||||||||||||||||||||||
[ ] | |||||||||||||||||||||||||||
| A. about stress and how to relieve your stress B. that there are many reasons for having stress C. that laughing and smiling more can help relieve your stress |