forced ventilation : 27 phrases in 13 subjects |
Aviation medicine | 1 |
Construction | 2 |
Energy industry | 2 |
Firefighting and fire-control systems | 3 |
General | 2 |
Makarov | 2 |
Mining | 1 |
Production | 1 |
Sakhalin | 1 |
Shipbuilding | 2 |
Silicate industry | 2 |
Technology | 4 |
Weapons of mass destruction | 4 |