air-circulation: 44 phrases in 15 subjects |
Agriculture | 3 |
Chemistry | 1 |
Coal | 1 |
Construction | 4 |
Electronics | 1 |
Energy industry | 1 |
General | 2 |
Materials science | 3 |
Mechanic engineering | 1 |
Medical appliances | 2 |
Metallurgy | 2 |
Mining | 3 |
Municipal planning | 7 |
Refrigeration | 8 |
Technology | 5 |