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hydroel.st. 配水干管
met. 馈电干线; 供电干线
refrig. 给水总管
tech. 进料总管; 给水干管
feed main: 26 phrases in 10 subjects
Aviation1
Earth sciences2
Electronics2
Geophysics1
Metallurgy1
Military1
Nuclear and fusion power1
Space2
Technology13
Textile industry2