 |
|
effective concentration : 21 phrases in 11 subjects |
| Biochemistry | 1 |
| Chemistry | 1 |
| Ecology | 2 |
| Firefighting and fire-control systems | 2 |
| Geophysics | 2 |
| Material safety data sheet | 1 |
| Medical | 5 |
| Military | 1 |
| Pharmacy and pharmacology | 1 |
| Solar power | 3 |
| Weapons of mass destruction | 2 |