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| 封井器 (нефть) | |||
| 防喷器; 封井器 | |||
| 防护剂; 防护器 | |||
| превентер: 50 phrases in 4 subjects |
| Drilling | 40 |
| General | 6 |
| Oil processing plants | 2 |
| Technology | 2 |
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