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频率变 换: 43 phrases in 16 subjects |
Agriculture | 1 |
Air defense | 2 |
Animal husbandry | 1 |
Aviation | 2 |
Communications | 1 |
Electric machinery | 2 |
Electronics | 9 |
General | 2 |
Geophysics | 2 |
Information technology | 1 |
Metallurgy | 1 |
Shipbuilding | 1 |
Space | 2 |
Technology | 14 |
Telecommunications | 1 |
Wind Energy | 1 |