The problems in current statistical methods to count the drilling time in petroleum drilling reference are analyzed.
分析了在现行石油钻井资料中钻井时间统计方面存在的问题。
Optimized drill-hole spacing and drilling techniques eliminate "blank zones" in longwall faces prone to outbursts
优化钻孔间距与工艺 消除突出综采面“空白带”
Study on Rational Borehole Space of Crossed Boreholes for Gas Pre-drainage
预抽煤层瓦斯交叉钻孔合理孔间距的研究
Supporting the use of impact drilling electric drill. Drilling, hole spacing with hole depth should meet the design requirements.
（1）钻孔使用配套冲击电钻.钻孔时,孔洞间距与孔洞深度应满足设计要求.
Application of Polar Iso-distance Net in Drawing Borehole Track Plane Projecion and Analysing Borehole Inclination Law
极等间距网在钻迹成图及孔斜规律分析中的应用
ratio of the pole spacing to the bore diameter of the pole pieces
极靴的间距与孔径比
The practice and application of kilometer-orientated large diameter and long-distance drilling
千米定向大直径长距离钻孔的实践与应用
Relationship between Interpupillary & Innercanthal Distance and Maxillary Anterior Teeth of People with Normal Occlusion
正常者瞳孔间距、内眦间距与上颌前牙的关系
Their precise ages are thus debatable.
因此，它们被钻孔的时间仍然存在争论。
tap(ping) drill
螺丝孔钻，螺丝底孔钻
The sorker was drilling.
此工人在用钻孔机钻孔。
The analysis of interval between long screw auger taking clay and static pressuring pile
长螺旋钻孔取土与静力压桩时间间隔的分析
Any of numerous hand tools for boring holes.
钻孔工具，手钻钻孔用的手持工具
In perforated continuous forms paper, the interval between cuts.
在穿孔的连续格式纸上，割线之间的间距。
A: The interval is too long. I'm afraid. Could you deliver the drillers sooner?
恐怕时间隔太长了。能不能快些交付钻孔机？
kelly for well-drilling machiens
旋转钻孔,钻井机用
A tool used for drilling.
钻头用于钻孔的工具
a steel drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows.
用于石器或石匠术钻孔的有星形钻头的钢钻；通过锤子的敲击来工作，两次敲击之间旋转。
boring method (of pulp sampling)
（纸浆取样）钻孔法