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| циркуляция котла: 51 phrases in 12 subjects |
| Construction | 4 |
| Electrical engineering | 1 |
| Electronics | 4 |
| Energy industry | 10 |
| Forestry | 3 |
| Mechanic engineering | 2 |
| Nautical | 8 |
| Public utilities | 1 |
| Rail transport | 2 |
| Technology | 8 |
| Thermal engineering | 7 |
| Wood processing | 1 |