造成柱塞泵振动超限的原因主要有()A、电机轴弯曲,电机转子动不平衡 B、电机或泵滚动轴

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问题:

造成柱塞泵振动超限的原因主要有()

A、电机轴弯曲,电机转子动不平衡

B、电机或泵滚动轴承损坏

C、填料总成压盖松动退出,与连接卡子发生撞击

D、泵供液不足造成打空泵

E、液体输送管漏液

考点:加气站操作员考试加气站操作员高级工考试加气站操作员高级工考试题库
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恩格斯在《反杜林论》中指出:“这种历史情况也决定了社会主义创始人的观点。不成熟的理论是和 不成熟的资本主义状况、不成熟的阶级状况相适应的。”引文中“社会主义创始人”是指  [ ]

A.法国启蒙思想家

B.马克思和恩格斯

C.空想社会主义者

D. * * 主义者同盟的领导人

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铁路油罐车装卸油鹤管的种类有()、万向鹤管、拆装式鹤管、()、()、大鹤管,它的主体一般是由直径为()的铝管制成。

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Losing a job or not being able to find one almost always brings unwelcome changes. If you’’ve lost a job, the first feeling is often one of shock. On top of the loss of income, many people find the whole routine of their life is shattered, their contact with other people reduced, their ambitions halted and their identity as a worker removed.There may be good feelings too — it’’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think — a better job may be just around the corner. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely.Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’’s up to you.

According to this passage, unemployment may________.

A.cause people to lose touch with reality

B.completely destroy people’s life patterns

C.lessen interaction with people

D.reduce people’s chances of promotion

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84g水中溶有16gNaCl,求NaCl的质量分数w(NaCl)。

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水导轴承的作用是什么?

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