One of the key problems of designing the control valve of modulation rotary steering drilling tool is the design of high pressure hole of upside valve.
设计调制式旋转导向钻井工具控制阀的关键问题之一是上盘阀高压孔的设计。
According to the features of the hole pouring pile construction technology, this paper analyzes the key points of quality control of pore-forming and pile-forming in the construction.
根据钻孔灌注桩施工工艺特点，详细分析和论述了施工中成孔和成桩质量控制要点。
It is one of the key techniques of improving timber quality of poplar to effectively control the nodal scars of stem and decrease the Numbers of insect hole.
有效地控制杨木节痕和减少虫眼是提高杨木质量的关键技术之一。
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