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| 导孔 | |||
| 前导钻孔; 超前钻孔 | |||
| 中空孔在平行空孔直线掏槽中，中空掏槽中不装药的炮孔，也叫导向孔。中空孔和装药炮孔之间的距离，取决于炮孔的直径和岩石性质,参见 burn hole | |||
| 定位孔; 先导孔; 装配孔; 导洞 | |||
| 导向孔; 导眼; 辅助孔; 领眼 | |||
| 定位〔装配，辅助〕孔 | |||
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pilot hole : 7 phrases in 2 subjects |
| Aviation | 1 |
| Technology | 6 |
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