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| 中频、高频和甚高频测向 | |||
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| 中高频和甚高频定向台 | |||
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medium, high and very high frequency direction-finding : 6 phrases in 4 subjects |
| Air defense | 2 |
| Earth sciences | 1 |
| General | 2 |
| Oil / petroleum | 1 |
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