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| 开发〔生产〕钻井 | |||
| 生产钻井 | |||
| 开发钻井 | |||
| 开拓钻孔; 详细勘探钻井 | |||
| development drilling: 7 phrases in 5 subjects |
| Drilling | 1 |
| Economy | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 2 |
| Technology | 2 |
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