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掩膜: 53 phrases in 12 subjects |
Agriculture | 1 |
Air defense | 1 |
Cartography | 1 |
Chemistry | 1 |
Computers | 1 |
Electronics | 15 |
Information technology | 5 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Space | 9 |
Technology | 13 |
Telecommunications | 3 |