1.
blank-casing bit
套管底部装用的环状钻头坯
2.
She asked the artist to paint in diamond necklace, ear-rings and tiara, even though she wore no jewelry.
她要画家画上钻石项链、耳环和冠状头饰，即使她没戴。
3.
a bit or drill having deep helical grooves.
有深螺旋状凹槽的一种钻头或钻井。
4.
Chip Removal Regularity and Bit Face Shape Selection in Impregnated Diamond Bit Drilling
孕镶金刚石钻头的排屑规律与钻头唇状选择
5.
unit-type drill head
组合钻床钻头, 标准钻头
6.
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
7.
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。
8.
an annular drilling bit to allow core samples to be taken.
用来获取采样的一种环形钻头。
9.
the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press.
钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换，用在钻柱钻柄或钻床上。
10.
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
11.
Research on Drill Wear Condition Monitoring Technology Based on the Drilling Force Signal;
基于钻削力信号的钻头磨损状态监测技术的研究
12.
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
13.
drill(ing) head
钻头; 主轴头; 钻床床头箱; 钻削动力头;钻头头部, 钎头
14.
DEVELOPMENT OF VARIABLE-ANGLE BENT SUB OF ROTARY STEERING DRILLING TOOL
基于旋转导向钻进方式的可控弯接头发展现状
15.
The shape of herniated discs liked semicircle or ellipsoidal.
在冠状位上呈钻头状，游离型椎间盘呈条索状，或不规则形。
16.
part of a drill that grips the bit
夹头（钻或钻床上用以夹住钻头的部分）.
17.
a small bit that drills a first hole to guide a larger drill.
钻凿初洞来导引大钻头的一种小钻头。
18.
easing the bit in
钻头轻压慢转钻进地层