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脉冲频谱 | |||
脉冲谱 | |||
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脉冲频谱 |
pulse spectrum : 34 phrases in 12 subjects |
Air defense | 6 |
Aviation | 2 |
Chemistry | 2 |
Earth sciences | 2 |
Electronics | 2 |
Geophysics | 2 |
Information technology | 2 |
Metallurgy | 1 |
Nuclear physics | 2 |
Oil / petroleum | 2 |
Space | 2 |
Technology | 9 |