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| вертикальная скважина | |||
| 垂 直 井: 15 phrases in 7 subjects |
| Drilling | 3 |
| Electronics | 1 |
| General | 3 |
| Geophysics | 1 |
| Oil / petroleum | 3 |
| Oil and gas | 1 |
| Technology | 3 |
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