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| frequency division modulation | |||
| 分频调制: 15 phrases in 9 subjects |
| Air defense | 1 |
| Electronics | 6 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Radio | 1 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 1 |
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