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系统 检查 : 110 phrases in 19 subjects |
Air defense | 1 |
Animal husbandry | 1 |
Automobiles | 2 |
Aviation | 34 |
Earth sciences | 2 |
Electronics | 24 |
General | 3 |
Information technology | 4 |
Metallurgy | 1 |
Mining | 1 |
Navigation | 1 |
Nursing | 1 |
Oil / petroleum | 1 |
Project management | 3 |
Shipbuilding | 10 |
Space | 6 |
Technology | 13 |
Telecommunications | 1 |
United States | 1 |