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pulse spectrum |
脉 冲 谱 : 71 phrases in 13 subjects |
Agriculture | 1 |
Air defense | 7 |
Aviation | 2 |
Chemistry | 4 |
Earth sciences | 6 |
Electronics | 6 |
General | 1 |
Geophysics | 8 |
Information technology | 1 |
Metallurgy | 2 |
Oil / petroleum | 8 |
Space | 3 |
Technology | 22 |