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separate-circuit controlling |
分线控制 : 13 phrases in 10 subjects |
Air defense | 2 |
Aviation | 1 |
Computer networks | 1 |
Earth sciences | 1 |
Electronics | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
Metallurgy | 1 |
Rail transport | 2 |
Space | 1 |
Technology | 1 |