self-contained breathing apparatus: 35 phrases in 20 subjects |
Aviation | 2 |
Biology | 1 |
Caspian | 1 |
Ecology | 2 |
Firefighting and fire-control systems | 2 |
Geology | 1 |
Hydrology | 1 |
Makarov | 2 |
Material safety data sheet | 1 |
Medical | 3 |
Military | 2 |
Nautical | 1 |
Occupational health & safety | 6 |
Oil / petroleum | 1 |
Production | 2 |
Security systems | 1 |
Submarines | 1 |
Technology | 2 |
Trademark | 1 |
Weapons of mass destruction | 2 |