Laser Drill Hole 激光痕 ; 雷射洞 ; 激光钻孔 ; 镭射洞
drill hole wall 钻孔壁
drill hole sampling 钻孔取样 ; 打眼取样法
drill-hole magnetometer 钻孔磁力仪
drill-hole returns 井口返出泥浆
drill-hole survey 测井斜 ; 测井
tap-drill hole 内螺纹预钻孔
layout of drill hole 钻孔布置
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A plug had been inserted in the drill hole.
那个钻孔里已经塞上了塞子。
"The drill hole is just a pinprick on an elephant's back," he said.
“钻井对于整个岩浆体来说只不过是大象背上的一个小针孔。”马施说。
In general can be twist drill hole, but you should drill holes, step and then expanded to the required diameter.
用一般的麻花钻即可开孔，但应先钻小孔，然后步扩大到所需直径。
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