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heavy oil
gen.	Schweröl n
tech.	schwerfluessiges Oel; Schweroel
heavy oils
transp.	Schweröle n

heavy-oil : 35 phrases in 12 subjects

Chemistry	10
Coal	1
Electronics	1
Energy industry	3
General	5
Materials science	3
Mechanic engineering	2
Metallurgy	2
Natural resourses and wildlife conservation	1
Oil / petroleum	1
Oils and lubricants	2
Technology	4