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| 井孔; 升降机井道; 楼梯井 | |||
| 电梯井 | |||
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| 升降机井道; 楼梯井 | |||
| 沉井井孔 | |||
| 升降机井道; 井底水仓; 深入孔; 泉井; 垂直大炮眼 | |||
| well-hole: 17 phrases in 7 subjects |
| Drilling | 3 |
| Engineering geology | 2 |
| Geology | 1 |
| Mechanics | 1 |
| Mining | 1 |
| Rail transport | 1 |
| Technology | 8 |
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