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标识位 : 25 phrases in 12 subjects |
Air defense | 2 |
Aviation | 8 |
Computer networks | 1 |
Computer numerical control | 1 |
Electronics | 1 |
General | 2 |
Information technology | 2 |
Metallurgy | 1 |
Navigation | 1 |
Oil / petroleum | 1 |
Technology | 4 |
Telecommunications | 1 |