试述电力机车排障器的作用。

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问题:

试述电力机车排障器的作用。

考点:电力机车钳工电力机车钳工(高级)电力机车钳工(高级)题库
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水钠潴留作用最弱的药物是

A.氢化可的松

B.可的松

C.泼尼松

D.泼尼松龙

E.地塞米松

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阅读理解

     People always think about "the problem of youth". If there is one-which I take leave to doubt-it is

older people who create it,not the young themselves.Let us get down to fundamentals and agree that the

young are after all human beings-people just like their elders.There is only one difference between an old

man and a young one:the young man has a beautiful future before him while the old man a splendid future

behind him and maybe that is where the rub is.

     When I was a teenager,I felt that I was just young and unknown-that I was a new boy in a huge

school,and I would have been very pleased to be regarded as something so interesting as a problem.For

one thing,being a problem gives you a certain identify,and that is one of the things the young are busily

engaged in seeking.

     I find young people exciting.They have an air of freedom,and they have not a dull promise to mean

ambitions or love of comfort.They are not anxious social climbers,and they have no devotion to important

things.All this seems to me to link them with life,and the origins of things.It's as if they were in some sense

of cosmic beings in violent and lovely contrast with us suburban (乡村的) creatures.All that is in my mind when I meet a young person.He may be too proud,illmannered,selfconfident or selfsatisfied,but I do not

turn for protection to boring clich?s about respect for elders as if age were a reason for respect.I accept

that we are equals,and I will argue with them,as an equal,if I think he is wrong.

1. "The problem of youth" in Paragraph 1 means the problem________.

A. caused by young people

B. needed to be solved by young people

C. young people meet

D. created by the old for the young

2. The underlined word "rub" is closest in meaning to________.

A. fact  

B. age

C. future  

D. difficulty

3. One of the things the young are engaged in is that they want to________.

A. climb up the social ladder

B. have freedom

C. be known

D. make troubles

4. By saying "anxious social climbers",the writer refers to________.

A. some mean adults  

B. ambitious young people

C. capable political leaders

D. people who pursue comfort

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国务院关于在我国统一实行法定计量单位的命令于()发布。

A、1983年2月27日

B、1984年2月27日

C、1985年2月27日

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连铸机液压系统由那几部分组成?

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在材料采购合同中,由供货方运送的货物,运输过程中发生的问题由( )负责。

A.供货方
B.运输部门
C.采购方
D.供货方和运输部门共同

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