问题 问答题 简答题

零起升压一般有哪些规定?

答案

参考答案:

(1)担任零起升压的发电机容量应足以防止发生自励磁,发电机强励退出,联跳其他非零起升压回路断路器的连片退出,其余保护均可靠投入。

(2)升压线路保护完整,可靠投入,联跳其他非升压回路断路器连接片退出,线路重合闸停用。

(3)对主变压器或线路串变压器零起升压时,该变压器保护必须完整并可靠投入,中性点必须接地。

(4)双母线中的一组母线进行零起升压时,母差保护应停用,母联断路器改为冷备用,防止断路器误合造成非同期并列。

(5)其他规程规定中确定的事项。

阅读理解

阅读理解。

      Steven Jobs, the CEO of Apple, was not a good student when he was in school. At that time, he

 always got into trouble with his schoolmates. When he went to college, he didn't change a lot. Then

 he dropped out (退学). But he was full of new ideas.

      After that, Steven Jobs worked as a video game designer in a company. He worked there only

 for a few months and then he went to India. He hoped that the trip would give him some new ideas

 and a new chance to change his life.

      Steven Jobs lived on a farm in California for a year after he returned from India. In 1975, he began

 to make a new type of computer. He designed the first Apple Computer with his friend in his garage.

 He chose the name "Apple" just because it reminded him of a happy summer he once  spent in an

 apple orchard.

      His first Apple Computer was a great success. Because of this, Steven Jobs soon became famous

 all over the world.

1. Steven Jobs always got into trouble with in school.

A. his schoolmates

B. his parents

C. his teachers

D. his brothers

2. Steven Jobs designed the first Apple Computer with his friend .

A. in his school

B. in his company

C. in his garage

D. at home

3. Which of the following statements is NOT true?

A. Steven Jobs didn't finish his college.

B. Steven Jobs worked as a video game designer in a company for a few months.

C. Steven Jobs soon became famous all over the world because of his first Apple Computer.

D. Steven Jobs chose the name"Apple"just because he liked eating apples.

填空题 案例分析题