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| 海上无线电通信 | |||
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maritime radio : 26 phrases in 8 subjects |
| Earth sciences | 2 |
| Electronics | 4 |
| General | 1 |
| Geophysics | 1 |
| Navigation | 2 |
| Technology | 14 |
| Telecommunications | 1 |
| United States | 1 |
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