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油 气 井 : 42 phrases in 10 subjects |
| Drilling | 3 |
| General | 7 |
| Geology | 8 |
| Geophysics | 2 |
| Oil / petroleum | 3 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Oil processing plants | 1 |
| Oilfields | 14 |
| Technology | 1 |
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