ahead three again ahead  再进三

a full set of drill pipe  全套管钻机

A New Tool of Preventing Drill Pipe Sticking  新型防卡钻具

abandon ship drill  弃船演习

abort drill  放弃演练

Abrasion drill  磨钻; 回转钻; 回旋钻

actual drill  实战

adamantine drill  金刚石钻机; 金刚石钻; 金刚石钻头

adjustable angular drill jig  角度可调钻孔夹具

adjustable multiple spindle drill  可调式多轴钻床

advanced percussive drill  超前冲击钻

air defense drill  防空演习

Air Drill  气钻; 风钻

air drill hammer  风锥钻

air hammer drill  风动凿岩机

air legmounted drill  CPLD可编程逻辑器件; 风动支架钻凿机

air motor drill  风钻

air rock drill  空气取样; 气动鑋石机

air-drifter drill  风动架式钻机