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| crossover frequency | |||
| inversion frequency | |||
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转换频率 : 52 phrases in 14 subjects |
| Air defense | 4 |
| Automobiles | 1 |
| Aviation | 2 |
| Computer networks | 1 |
| Earth sciences | 1 |
| Electronics | 26 |
| General | 1 |
| Geophysics | 1 |
| Information technology | 3 |
| Mathematics | 1 |
| Metallurgy | 1 |
| Space | 5 |
| Technology | 4 |
| Telecommunications | 1 |
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