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| квадратный вкладыш | |||
| 方瓦: 21 phrases in 8 subjects |
| Aviation | 1 |
| Chemistry | 3 |
| Drilling | 4 |
| General | 8 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Physics | 1 |
| Technology | 2 |
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