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| duplex simultaneous two-way | |||
| 双向双工: 25 phrases in 9 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Electronics | 2 |
| General | 1 |
| Information technology | 2 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 10 |
| Telecommunications | 4 |
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