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| power density spectrum | |||
| power density spectra | |||
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| power density spectrum | |||
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功率密度谱 : 30 phrases in 12 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Bridge construction | 2 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 9 |
| General | 1 |
| Geophysics | 1 |
| Mathematics | 2 |
| Space | 4 |
| Technology | 5 |
| Telecommunications | 2 |
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