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gas ratio
mining.	气体比
tech.	油气比; 离子电流率

gas ratio: 121 phrases in 17 subjects

Agriculture	1
Automobiles	5
Business	2
Drilling	1
Earth sciences	4
Ecology	4
Explosives and Explosive Ordnance Disposal	1
Geology	3
Management	1
Metallurgy	4
Mining	25
Oil / petroleum	42
Physics	1
Space	4
Surgery	1
Technology	21
Textile industry	1