effective concentration: 20 phrases in 11 subjects |
Biochemistry | 1 |
Chemistry | 1 |
Ecology | 2 |
Firefighting and fire-control systems | 2 |
Geophysics | 2 |
Material safety data sheet | 1 |
Medical | 4 |
Military | 1 |
Pharmacy and pharmacology | 1 |
Solar power | 3 |
Weapons of mass destruction | 2 |