 |
| |||
| return flame boiler; return flue boiler | |||
| return-flue boiler; return-tube boiler | |||
| оборотный котёл: 8 phrases in 4 subjects |
| Electrical engineering | 1 |
| Nautical | 2 |
| Shipbuilding | 3 |
| Thermal engineering | 2 |
|
| |||
| return flame boiler; return flue boiler | |||
| return-flue boiler; return-tube boiler | |||
| оборотный котёл: 8 phrases in 4 subjects |
| Electrical engineering | 1 |
| Nautical | 2 |
| Shipbuilding | 3 |
| Thermal engineering | 2 |