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| direction drilling | |||
| guided drilling | |||
| directional drilling | |||
| 定 向钻孔: 12 phrases in 5 subjects |
| Engineering geology | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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