 |
| |||
| 倒眼 (爆破用的一种炮眼) | |||
| 顶板孔巷道或回采区中顶部的炮孔 | |||
| 峒顶爆孔; 顶眼; 顶板炮眼; 倒眼 (爆破用一种炮眼) | |||
| |||
| 后爆炮孔组 | |||
| 后爆炮眼组 | |||
| back hole: 12 phrases in 6 subjects |
| Architecture | 2 |
| Drilling | 2 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Technology | 3 |
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