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| система приточной вентиляции: 28 phrases in 11 subjects |
| Aerohydrodynamics | 1 |
| Architecture | 2 |
| Aviation | 1 |
| Construction | 4 |
| Electronics | 1 |
| Energy industry | 2 |
| Firefighting and fire-control systems | 3 |
| General | 3 |
| Technology | 5 |
| Ventilation | 5 |
| Weapons of mass destruction | 1 |