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| 钻井工程 | |||
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well works : 16 phrases in 9 subjects |
| China | 2 |
| Ecology | 1 |
| Economy | 1 |
| Engineering geology | 1 |
| General | 3 |
| Geophysics | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Technology | 5 |
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