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surface active
comp.	active area
el.	active surface
mech.eng.	face of tooth; flank; tooth flank; tooth surface
mech.eng., el.	wind collector
med.appl.	active surface (of ultrasonic head); effective irradiation surface (of ultrasonic head)

surface active : 12 phrases in 6 subjects

Chemistry	1
Earth sciences	2
Information technology	1
Metallurgy	6
Natural resourses and wildlife conservation	1
Transport	1