问题 问答题 简答题

牵引变压器自动切除,引起DJ断开的处理过程?

答案

参考答案:

(1)检查LT或TD屏电子仪器第一页的变压器温度,如果切除的牵引变压器油温过高且大于150°,则维持运行,不需进行复位操作,待温度下降至140°时可进行小复位恢复。

(2)如变压器油温不高,随车机械师可将牵引变压器切除车辆QEL柜内的CLTA和CLTB的供电空开20Q045和20Q05断开10S后重新闭合,并通知司机做小复位。

(3)同时观察显示屏维护菜单中的故障描述,查看具体故障原因,然后降弓小复位操作,如果故障仍然存在,维持运行,必要时前方停车站做断蓄电池复位操作;

(4)观察显示屏设备状态确定CLTA和CLTB同时通信故障,需检查MVB连接器及扯端连接器;

(5)如果辅助供电扩展正常,维持运行。

阅读理解

阅读理解。

     About six years ago I was eating lunch in a restaurant in New York City when a woman and a young boy

sat down at the next table, I couldn't help overhearing parts of their conversation. At one point the woman

asked, "So, how have you been?" And the boy-who could not have been more than seven or eight years old-

replied. "Frankly, I've been feeling a little depressed lately."

     This incident stuck in my mind because it confirmed (确认) my growing belief that children are changing.

As far as I can remember, my friends and I didn't find out we were "depressed", that is, in low spirits, until

we were in high school.

     Undoubtedly a change in children has increased steadily in recent years. Children don't seem childlike

anymore. Children speak more like adults, dress more like adults and behave more like adults than they used

to.

     Whether this is good or bad is difficult to say, but it certainly is different. Childhood as it once was no

longer exists. Why?

     Human development is depended not only on born biological states, but also on patterns of gaining social

knowledge. Movement from one social role to another usually involves learning the secrets of the new social

positions. Children have always been taught adult secrets, but slowly and in stages; traditionally, we tell sixth

graders things we keep hidden from fifth graders.

     In the last 30 years, however, a secret-revelation (揭示) machine has been equipped in 98 percent of

American homes. It is called television. Television passes information to all viewers alike, whether they are

children or adults. Unable to resist the temptation (诱惑), many children turn their attention from printed texts

to the less challenging, more attractive moving pictures.

     Communication through print, as a matter of fact, allows for a great deal of control over the social

information which children will gain. Children must read simple books before they can read complex materials.

1. According to the author, feeling depressed is _____. [ ]

A. a sure sign of a mental problem in a child

B. a mental state present in all humans, including children

C. something that cannot be avoided in children's mental development

D. something hardly to be expected in a young child

2. Traditionally, a child is supposed to learn about the adult world _____. [ ]

A. through connection with society

B. gradually and under guidance

C. naturally without being taught

D. through watching television

3. According to the author, that today's children seem adultlike results from _____. [ ]

A. the widespread influence of television

B. the poor arrangement of teaching content

C. the fast pace of human scientific development

D. the rising standard of living

4. What does the author think of communication through print for children? [ ]

A. It enables children to gain more social information.

B. It develops children's interest in reading and writing.

C. It helps children to read and write well.

D. It can control what children are to learn.

5. What does the author think of the change in today's children? [ ]

A. He feels their adultlike behavior is so funny.

B. He thinks people should pay attention to the change.

C. He considers it a rapid development.

D. He seems to be upset about it.

单项选择题