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| 环空; 油套环空; 管外环形空间; 管外空间 | |||
| 管孔余隙; 管外间隙 | |||
| затрубное пространство: 16 phrases in 6 subjects |
| Drilling | 3 |
| General | 2 |
| Oil / petroleum | 4 |
| Oilfields | 3 |
| Sakhalin | 3 |
| Technology | 1 |
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