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放大器输出 : 40 phrases in 13 subjects |
Air defense | 1 |
Automobiles | 2 |
Aviation | 2 |
Electronics | 11 |
General | 1 |
Geophysics | 1 |
Information technology | 1 |
Metallurgy | 1 |
Project management | 1 |
Radio | 1 |
Space | 3 |
Technology | 14 |
Wind Energy | 1 |