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条信号 : 47 phrases in 11 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Communications | 1 |
| Construction | 3 |
| Electronics | 1 |
| General | 3 |
| Mathematics | 1 |
| Multimedia | 1 |
| Space | 1 |
| Technology | 25 |
| Telecommunications | 7 |
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