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| 无线电发射器频率 | |||
| 发射机频率 | |||
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transmitter frequency : 31 phrases in 7 subjects |
| Air defense | 4 |
| Aviation | 2 |
| Electronics | 7 |
| Metallurgy | 1 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 14 |
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