减速箱内有不正常的敲击声是何原因?如何排除?

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问题:

减速箱内有不正常的敲击声是何原因?如何排除?

考点:采油工考试采油高级工考试采油高级工考试题库
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阅读短文,判断正(T)误(F)。

   Wenchuan Earthquake(地震) happened on May 12,2008. People from all over China and the world

sent a lot of help.  Children in different places gave their clothes,books,toys and money.

   Earthquake is a disaster(灾难).  How can we protect(保护 ) ourselves when the earth-quake happens?

Here are some tips:

     1. Try to keep calm. Don't walk around.

     2. If you are indoors, hide under a desk or a table,

     3. If you are outdoors, go to an open area(空地).

     4. If you are at home, ask Mum or Dad to turn off the lights.

     5. Don't go into a lift(电梯). If you are in the lift, get out of the lift quickly.

( ) 1. Wenchuan Earthquake happened in 2009.

( ) 2. If you are indoors, you should walk around.

( ) 3. If you are outdoors, go to an open area.

( ) 4. If you are at home, you should turn on the lights.

(     ) 5. If you are in the lift, you should get out of the lift quickly.

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银行证券投资的主要功能有( )。

A.保持流动性,获得收益

B.为银行提供新的资金来源

C.合理避税

D.分散风险

E.提高资产质量

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研究的内部效度和外部效度的关系是()。

A.内部效度是外部效度的充分必要条件

B.内部效度是外部效度的充分但不必要的条件

C.内部效度是外部效度的必要但不充分条件

D.内部效度是外部效度的既不充分也不必要条件

E.外部效度是内部效度的必要条件

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分线箱是设置在用户线中间的主干电缆与配线电缆的接口装置。

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最小割集

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