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| beacon frequency | |||
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信标频率 : 21 phrases in 9 subjects |
| Air defense | 3 |
| Aviation | 4 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 2 |
| Space | 1 |
| Technology | 4 |
| Telecommunications | 3 |
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