channel section: 34 phrases in 18 subjects |
Aerohydrodynamics | 1 |
Automobiles | 3 |
Aviation | 2 |
Building materials | 3 |
Construction | 4 |
General | 1 |
Hydrology | 2 |
Makarov | 1 |
Mass media | 3 |
Mathematics | 1 |
Mechanic engineering | 1 |
Mechanics | 1 |
Nautical | 2 |
Physics | 1 |
Plastics | 3 |
Rail transport | 1 |
Technology | 2 |
Telecommunications | 2 |