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| 通信信号 | |||
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| 通信信号 | |||
| communication signals: 25 phrases in 10 subjects |
| Aviation | 1 |
| Bridge construction | 1 |
| Communications | 3 |
| Computer networks | 2 |
| Electronics | 2 |
| General | 1 |
| Information technology | 1 |
| Space | 5 |
| Technology | 6 |
| Telecommunications | 3 |
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