 |
| |||
| raise boring; raise driving | |||
| |||
| raise driving | |||
| 天 井 掘进: 11 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 8 |
| Technology | 3 |
|
| |||
| raise boring; raise driving | |||
| |||
| raise driving | |||
| 天 井 掘进: 11 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 8 |
| Technology | 3 |