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空中交通指挥
| 信号系统
| 空中交通指挥 | |
| gen. | air traffic control |
| 信号系统 | |
| archit. | beaconage |
| compr. | annunciator system |
| space | annunciation system; signal system |
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| air traffic control | |||
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| air traffic control | |||
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空中交通指挥 : 7 phrases in 4 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Communications | 1 |
| General | 2 |
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