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| 调幅一调频 | |||
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| 调幅/调频 | |||
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amplitude modulation - frequency modulation : 27 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 1 |
| Earth sciences | 3 |
| Electronics | 10 |
| Geophysics | 6 |
| Radio | 1 |
| Space | 1 |
| Technology | 2 |
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