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1·The sales, maintenance and service of rotary drilling rig drill rod;

旋挖钻机钻杆的销售、维修、服务；

2·The paper analyses each parts of rotary mechanism of rotary drill rig.

本文针对钻机回转机构的各零部件进行一定分析。

3·It is a walking-frame rotary drill rig, suitable for industrial and civil piling construction.

该机是适应于工业与民用建筑桩基础施工的步履式螺旋钻机。

4·The rotary drill stem will engender direction drift in rotary drilling of directional well and cluster well.

在定向井及丛式井的转盘钻进中，旋转钻柱会产生方位漂移。

5·The method of rotary drilling hole and protecting hole wall by static mud is an advanced technique to drill hole.

静态泥浆护壁旋挖成孔工艺是一项先进的成孔工艺。

6·The rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.

牙轮钻机钻凿的岩层是随机分布、错综复杂的，因而钻进过程难以定义。

7·This paper analyses the main factors that influence the speed of drilling hole, puts forward the methods to settle the main working parameters of the rotary drill.

分析了影响牙轮钻机钻孔速度的主要因素，提出了钻机主要工作参数的确定方法。

8·This paper describes how the rotary drilling stem lost its stability in detail, and presents the main factors influencing drill stem stability in rotary condition.

系统地进行了斜直井中旋转状态下钻柱稳定性的试验研究，描述了旋转钻柱失稳的过程，分析了旋转状态下影响钻柱稳定性的主要因素。

9·GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.

GCF - 2 0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。

10·GCF-20A reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.

0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。