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定时脉冲: 45 phrases in 14 subjects |
Air defense | 2 |
Aviation | 2 |
Computers | 1 |
Construction | 3 |
Electronics | 8 |
Explosives and Explosive Ordnance Disposal | 1 |
Hydroelectric power stations | 1 |
Information technology | 1 |
Metallurgy | 3 |
Military | 1 |
Oil / petroleum | 1 |
Space | 8 |
Technology | 12 |
Telecommunications | 1 |