MGTY250/600-1.1D电牵引采煤机端头站出现控制信号不能发出、信号不能复位

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问题:

MGTY250/600-1.1D电牵引采煤机端头站出现控制信号不能发出、信号不能复位等故障应如何查找?

考点:综采维修电工综采维修电工(高级)综采维修电工(高级)题库
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How do you like to go to school like this one in Oxford, England? There are no real classes. The students go from one group to another when they want to. You may find students of fourteen, sixteen or twenty - one years old all in the same group. They work at their own studies. Nobody tells them what they should do or what they shouldn’t do.

The day I visited, school began at nine. Some students were listening to their own lessons. Others were watching TV on physics. A group was working in the library. I didn’t see anybody just sit doing nothing. Everybody was studying.

At lunch time I could see students working, too. They were talking about their lessons while they were eating. When you think of those students, you can be sure it is one of the best schools in the world.

小题1:In this school in Oxford, the students _______.

A. are all teenagers

B.     don' t study in groups

C.     never study in any real classes

小题2:Every student is working at _______in this school.

A.      the same thing

B.       a different thing

C.       his or her own studies

小题3:It is true that_______.

Ahis school is one of the best schools in the world

Bhe students in this school like to study in the same group

Che students in this school learn everything by discussing with others

题型:问答题 简答题

在环境化学污染物中,一次污染物是指()。

A.从污染源排入环境后,理化特性发生了变化的污染物

B.从污染源直接排入环境,理化性质未发生变化的污染物

C.从污染源排入环境后,其毒性增大的污染物

D.多个污染源同时排出的同一类污染物

E.多种环境介质中都存在的同一类污染物

题型:问答题 简答题

利用抽签方法,直接从总体中抽取若干个体作为样本,这种取样方法属于()

A.简单随机取样法

B.系统随机取样法

C.分层随机取样法

D.整群随机取样法

题型:问答题 简答题

下列各项,不属于竹叶石膏汤证临床表现的是()

A.气逆欲呕

B.心胸烦闷

C.身热多汗

D.虚烦不寐

E.舌红苔腻

题型:问答题 简答题

()作用是起到改变介质流向的作用。

A.直通、异径管

B.直通、异径管

C.弯头

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