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井下控制 : 15 phrases in 8 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mechanics | 1 |
| Mining | 1 |
| Navigation | 2 |
| Oil / petroleum | 6 |
| Technology | 2 |
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