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| 定向无线电台 | |||
| 定向无线电收信机 | |||
| 无线电定向 | |||
| 定向无线电 | |||
| directional radio: 28 phrases in 5 subjects |
| Air defense | 3 |
| Aviation | 6 |
| Electronics | 2 |
| Space | 1 |
| Technology | 16 |
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