1.
an annular drilling bit to allow core samples to be taken.
用来获取采样的一种环形钻头。
2.
brace countersink
钝角菊花形尖头板钻
3.
diagonal cut rock drill plus bits
对角十字形岩石钻头
4.
cross-bladed chisel bit
十字刮刀楔形齿钻头
5.
shaped insert bit
非球形硬合金齿钻头
6.
shoulder dressing tool
钻杆接头端面整形工具
7.
cone type roller bearing rock bit
滚柱轴承锥形牙轮钻头
8.
A needle-shaped drill for boring holes in rock or masonry.
钻头，钻石器，钻孔器用于在岩石或砖石上钻孔的针形钻
9.
the round part of the bit by which it is held in the drill.
钻头上的控制钻孔机的圆形部分。
10.
Improvement of Drill Point Geometry for Drilling High Manganese Steel ZGMn13;
钻削高锰钢ZGMn13钻头刃形改进研究
11.
unit-type drill head
组合钻床钻头, 标准钻头
12.
A surgical instrument having circular, sawlike edges, used to cut out disks of bone, usually from the skull.
环钻一种用于切除骨片的手术工具，有圆形锯状刀锋，通常用于头盖骨手术
13.
5.8 Circulate for one and a half hour and then pull the string out at 14:30.
循环一个半钟头，14:30起钻。
14.
blank-casing bit
套管底部装用的环状钻头坯
15.
Finite element analysis of the screw structure of the drill-stem junction
钻杆接头螺纹结构形式的有限元分析
16.
Experimental and Drill Bit Flow Field Analyze of Run-through DTH Reverse Circulation Drilling Technique;
贯通式潜孔锤反循环钻进技术试验及钻头流场分析
17.
The research of supersonic multi-nozzle ejector reverse circulation bit
超音速多喷嘴引射器式反循环钻头研究
18.
drill(ing) head
钻头; 主轴头; 钻床床头箱; 钻削动力头;钻头头部, 钎头