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off valve
subm.	关阀

off valve: 212 phrases in 25 subjects

Agriculture	4
Automobiles	11
Aviation	29
Chemistry	2
Compressors	4
Drilling	9
Electric machinery	1
Electronics	8
Engineering geology	2
Hydroelectric power stations	10
Mechanic engineering	3
Mechanics	1
Metallurgy	14
Nautical	3
Oil / petroleum	15
Oil processing plants	2
Pest control	3
Plastics	4
Rail transport	9
Space	7
Steel production	2
Surgery	1
Swimming	1
Technology	65
Wind Energy	2