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| direction radio beacon | |||
| directional radio beacon; directive radio beacon | |||
| 定向无线电信标: 9 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 1 |
| General | 1 |
| Radio | 1 |
| Space | 1 |
| Technology | 3 |
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