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辐射源 : 119 phrases in 16 subjects |
Agriculture | 2 |
Air defense | 32 |
Aviation | 1 |
Chemistry | 3 |
Communications | 2 |
Earth sciences | 5 |
Electronics | 13 |
General | 1 |
Geophysics | 1 |
Metallurgy | 5 |
Nuclear physics | 3 |
Oil / petroleum | 5 |
Shipbuilding | 1 |
Space | 17 |
Technology | 26 |
Telecommunications | 2 |