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level instrument |
位面 计 : 22 phrases in 11 subjects |
Chemistry | 4 |
Commerce | 1 |
Construction | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
Geophysics | 4 |
Hydroelectric power stations | 1 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Shipbuilding | 2 |
Space | 1 |
Technology | 4 |