current status and prospect of electric motor on top drive drilling system

the newest development abroad about top drive drilling system

国外顶部驱动钻井系统的最新进展

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technology of virtual prototyping in top drive drilling system

顶部驱动钻机的虚拟样机开发

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towards technology of virtual prototyping in top drive drilling system

顶部驱动钻机虚拟样机技术研究

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the research and implementation of virtual prototype in the top drive drilling system

顶驱钻机虚拟样机原型系统研究与实践

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the flourishing top-drive drilling system in the past 20 years has accomplishes a historic leap of rig modernization.

20多年来世界上蓬勃发展的顶部驱动钻井装置，实现了钻机现代化的历史性跨越。

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in this paper, author had studied the hydraulic top drive drilling system and conducted a series of innovative research work.

本文对液压顶部驱动钻井系统进行了研究；开展创新研究工作。

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the top drive drilling system, divided into electrical top drive and hydraulic top drive.

顶部驱动钻井装置，分为电驱动顶驱和液压驱动顶驱。

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in view of this, author launched the design and research in a full-hydraulic top drive drilling system.

鉴于此，笔者开展了全液压顶部驱动钻井系统的设计与研究。

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the top drive drilling system is one of the outstanding achievements which is the development renewal of automated drilling.

顶部驱动钻井系统是钻井自动化发展更新的突出成果之一。

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with changing views on marriage and love, twilight romance is being accepted by society.

随着婚恋观的转变，黄昏恋也日渐为社会所接受。

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this is worth its weight in gold. if they are, what format do they prefer?

这个信息十分有价值，如果他们喜欢，哪一种格式是他们喜欢的？

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t's only 34 centimeters tall but, as the highest honour in the world of cinema, an oscar is worth its weight in gold.

小人只有34厘米高，但是它却是电影界的最高荣誉，他的价值相当于同样重量的黄金的价值。

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worth its weight in gold.

与其等量重的黄金价值相等

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local knowledge is worth its weight in gold.

当地的市场行情极具价值。

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whatever does that for you is worth its weight in gold.

不论如何，这么做对你来说它的价值可以与金子相比。

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the canadian film board is worth its' weight in gold. the quality of films they produce is incredible.

加拿大电影局是相当优秀的。他们制作的电影品质好得没话说。

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sometimes an out-of-print book could be worth its weight in gold.

有时一本绝版的书是很贵重的。

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summary of main control valve

主控制阀概。

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function and structure of main control valve for hyundai hydraulic excavator

现代液压挖掘机斗杆阀联的结构

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the detection and significance of chlamydia and mycoplasma in the local site of cervical erosion

宫颈糜烂局部衣原体及支原体的检测及意义

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