应急措施: 25 phrases in 15 subjects |
Air defense | 1 |
Architecture | 1 |
Aviation | 3 |
China | 4 |
Desert science | 1 |
Earth sciences | 1 |
Economy | 2 |
Electronics | 1 |
Engineering geology | 1 |
Metallurgy | 2 |
Nautical | 1 |
Oil / petroleum | 1 |
Space | 3 |
Technology | 2 |
United Kingdom | 1 |