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| 无线电信号 | |||
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radio signal : 66 phrases in 13 subjects |
| Air defense | 5 |
| Artificial intelligence | 1 |
| Automobiles | 1 |
| Aviation | 4 |
| Communications | 8 |
| Earth sciences | 1 |
| Electronics | 5 |
| General | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 4 |
| Technology | 29 |
| Telecommunications | 3 |
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