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per unit time stresses
math.	за единицу времени; на единицу времени
mech.	в единицу времени

per unit time: 32 phrases in 16 subjects

Aerohydrodynamics	1
Agriculture	1
Automated equipment	4
Biology	1
Construction	1
Economy	1
Firefighting and fire-control systems	1
General	2
Makarov	4
Mathematics	1
Mechanics	2
Metrology	1
Nautical	1
Programming	5
Quality control and standards	2
Technology	4