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钻油井 : 100 phrase in 14 subjects |
| Chemistry | 2 |
| Company name | 1 |
| Drilling | 31 |
| Earth sciences | 6 |
| Economy | 1 |
| General | 6 |
| Metallurgy | 1 |
| Mining | 1 |
| Nautical | 1 |
| Navigation | 1 |
| Oil / petroleum | 24 |
| Oil and gas technology | 1 |
| Project management | 1 |
| Technology | 23 |
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