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полезное действие stresses
gen.	efficacité f; efficace f
chem.	rendement m
met.	puissance effective
tech.	effet utile

полезное действие: 126 phrases in 25 subjects

Antennas and waveguides	4
Armored vehicles	1
Automated equipment	3
Aviation	37
Business	1
Chemistry	4
Computers	1
Construction	1
Electronics	1
General	4
Hydraulic engineering	4
Mathematics	4
Mechanic engineering	6
Metallurgy	4
Military	1
Mining	8
Natural resourses and wildlife conservation	1
Photography	1
Physics	1
Sports	1
Technology	10
Textile industry	1
Trucks/Lorries	25
United Nations	1
Water resources	1