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air traffic regulation | |||
air traffic control | |||
air route traffic control | |||
Air Traffic Control (卫星,苏联) | |||
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air traffic control system |
空中 交通 管制 : 196 phrases in 11 subjects |
Air defense | 15 |
Aviation | 130 |
Business | 1 |
China | 2 |
Electronics | 22 |
Explosives and Explosive Ordnance Disposal | 1 |
General | 9 |
Navigation | 1 |
Space | 8 |
Technology | 6 |
United Kingdom | 1 |