简述抽油机平衡计算的原因及平衡原理?

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问题:

简述抽油机平衡计算的原因及平衡原理?

考点:石油钻井工考试石油钻井工高级技师石油钻井工高级技师题库
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My cousin Li Ming is a senior three student, who devoted himself to his lessons every day. Last Saturday, as usual, he went to several class. In the evening, he continued to study at home until deeply into the night. He was too sleepy and tired that he couldn’t work effectively. In Sunday morning, he was about to do his lessons while his father came up and advised him to take a break. Soon they came up a good idea. They decided to go cycling in the countryside. Li Ming enjoyed himself competing and chatting with his father and felt relaxing in the open air. On Monday, Li Ming was energetic and active in class. He spent a whole day in the country, and Li Ming said what he had done was worth.

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质数最大的因数一定是(  )
A.质数B.合数C.无法确定
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《建设工程安全生产管理条例》规定,分包单位应当接受总承包单位的安全生产管理,分包单位不服从管理导致生产安全事故的,( )。

A.由总包单位承担主要责任

B.由分包单位承担主要责任

C.由分包单位承担全部责任

D.由总包单位承担全部责任

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制氧流程主要由()所组成。

A、空气压缩系统;

B、制冷系统;

C、精馏系统;

D、净化系统。

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中国出入境检验检疫的作用主要体现在( )。

A.出入境检验检疫是国家主权和管理职能的体现

B.出入境检验检疫是我国对外贸易顺利进行和持续发展的保障

C.出入境检验检疫对保护农林牧渔业的生产安全具有重要意义

D.出入境检验检疫是保护我国人民健康的重要屏障

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