气 密试验 : 64 phrases in 18 subjects |
Automobiles | 2 |
Aviation | 2 |
Business | 1 |
Chemistry | 1 |
Compressors | 1 |
Electric machinery | 2 |
Electronics | 1 |
Hydroelectric power stations | 1 |
Management | 1 |
Metallurgy | 4 |
Nautical | 1 |
Oil / petroleum | 4 |
Rail transport | 3 |
Refrigeration | 2 |
Shipbuilding | 21 |
Space | 6 |
Technology | 9 |
United States | 2 |