| |||
| 分段崩落采矿法; 矿块崩落法 | |||
| |||
| 柱子坍陷法 | |||
|
block caving method : 2 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |
| |||
| 分段崩落采矿法; 矿块崩落法 | |||
| |||
| 柱子坍陷法 | |||
|
block caving method : 2 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 1 |
| Technology | 1 |