O₂: 114 phrases in 20 subjects |
Agriculture | 8 |
Automobiles | 32 |
Chemistry | 2 |
Earth sciences | 4 |
Ecology | 1 |
Electronics | 13 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 5 |
Genetics | 1 |
Metallurgy | 12 |
Nautical | 2 |
Nuclear physics | 3 |
Nursing | 2 |
Perfume | 2 |
Pharmacology | 1 |
Sports | 1 |
Steel production | 1 |
Surgery | 1 |
Technology | 14 |
Water resources | 8 |