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| external heating: 36 phrases in 18 subjects |
| Chemistry | 1 |
| Construction | 2 |
| Electrical engineering | 1 |
| Energy industry | 2 |
| Firefighting and fire-control systems | 2 |
| Food industry | 1 |
| Makarov | 3 |
| Mathematics | 2 |
| Meteorology | 1 |
| Nanotechnology | 1 |
| Nautical | 6 |
| Physics | 1 |
| Polymers | 1 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Silicate industry | 2 |
| Technology | 5 |
| Wood processing | 3 |
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