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| 无线电测向 | |||
| 无线电辐射测向导航，寻的 | |||
| 无线电寻的 | |||
| 无线电自导引 | |||
| 无线电探向 | |||
| radio homing: 11 phrases in 5 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Electronics | 1 |
| General | 1 |
| Technology | 4 |
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