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critical area: 27 phrases in 11 subjects |
Agriculture | 1 |
Automobiles | 1 |
Aviation | 3 |
Earth sciences | 1 |
Ecology | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
Hydroelectric power stations | 2 |
Nautical | 2 |
Space | 4 |
Technology | 9 |
Water resources | 2 |