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| signal selection | |||
| 信号 选择: 28 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 3 |
| Bridge card game | 1 |
| Communications | 1 |
| Electronics | 3 |
| General | 1 |
| Geophysics | 1 |
| Space | 1 |
| Technology | 10 |
| Telecommunications | 4 |
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