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| площадь проёмов (в ограждающих конструкциях и перекрытиях помещения) | |||
| opening area: 13 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Construction | 2 |
| Drilling | 1 |
| Firefighting and fire-control systems | 2 |
| Mathematics | 2 |
| Medical | 1 |
| Nautical | 1 |
| Technology | 2 |