pilot hole meaning in English
超钻
导洞
导坑
导向孔
导向钻孔
道洞
定位孔
试坑
引导孔
装配孔
Examples
- Discussion on coalmine shaft pilot hole related data processing
煤矿井筒检查孔有关资料处理方法探讨 - Since the inception of this project in 1998 , three pre - pilot holes have been completed and the main hole has reached a depth of over 3500 m
从98年开始，已经完成3个预先导孔的钻探工作，主孔钻进深度已经超过3500米。