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| 功率光谱密度 | |||
| 功率谱密度 | |||
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power spectrum density : 14 phrases in 9 subjects |
| Air defense | 2 |
| Bridge construction | 2 |
| Communications | 1 |
| Electronics | 4 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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