Thus in an operation such as drilling or punching, the positioning and cutting take place sequentially.
因此在一个操作中，如钻或冲孔操作先定位在加工。
2
The deep well automatic vertical drilling tools positioning at thousands of meters, the hydraulic steering mechanism of them is demand of upper performances.
深井自动垂直钻井工具工作于数千米深的井下，对其上的液压导向机构的性能有较高的要求。
3
As a mobile ocean platform, and owing to its high positioning capacity and good operation stability, the self-elevation drilling platform takes a leading role in continetial shelf exploration.