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| концентричная насосно-компрессорная колонна (string) | |||
| концентрическая насосно-компрессорная колонна | |||
| концентрическая лифтовая колонна | |||
| concentric tubing: 6 phrases in 3 subjects |
| Oil / petroleum | 3 |
| Oil and gas | 2 |
| Oilfields | 1 |
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