Rotary control head is a key device in underbalanced drilling. Combined with other units, drilling while blowing out can be achieved.

旋转控制头是负压钻井的一个关键装置，利用它和其它地面设备可实现边喷边钻。

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In the process of drilling, the rotating control head is often damaged by the lateral force of the kelly, and this may lead to serious accident.

在钻井过程中，方钻杆的侧向力作用常常导致旋转控制头损坏，造成事故。

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And then, the mathematics model was firstly set up to analyze the force that the rotary control head endured when the preventer installed aslant.

并在此基础上通过建立力学数学模型完成旋转控制头在安装偏斜的情况下的动力学分析。

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Brian Flynn,head of operations at the European air traffic control body, addressed a press conference in Brussels.

VOA: standard.2010.04.16

In taking control of my head, he was doing more than just trying to focus my attention.

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There was no control group or head-to-head comparison with embolization.

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That type of design uses three parallel arms to control the print head, enabling a device that's not only "fun to watch, " according to the group, but that can also quickly print high resolution objects with a large 9-inch by 11-inch build envelope.

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