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| 双向通道双工通道; 双通道 | |||
| 双工信道 | |||
| 双向信道 | |||
| 双向信道通道 | |||
| 双向通道 | |||
| 双路通路; 双波道 | |||
| 双工通道 | |||
| duplex channel: 14 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Electronics | 1 |
| Information technology | 2 |
| Space | 1 |
| Technology | 5 |
| Telecommunications | 1 |
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