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| 谱功率分布 | |||
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spectrum power density : 15 phrases in 10 subjects |
| Air defense | 2 |
| Bridge construction | 2 |
| Communications | 1 |
| Electronics | 4 |
| General | 1 |
| Geophysics | 1 |
| Mathematics | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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