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| very high frequency direction | |||
| very high frequency direction finding | |||
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甚高频测向 : 46 phrases in 10 subjects |
| Air defense | 6 |
| Aviation | 15 |
| Electronics | 4 |
| General | 5 |
| Geophysics | 3 |
| Navigation | 2 |
| Oil / petroleum | 1 |
| Radio | 2 |
| Space | 3 |
| Technology | 5 |
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