от ... к

От ... к

 How reproducible is the behavior of these bearings from run to run and from bearing to bearing? (... от опыта к опыту ...)

 Product form was apparently not a factor in the heat-to-heat variability previously noted [...] in studies on wrought Alloy 718. (... непостоянство свойств от плавки к плавке, отмеченное ранее ...)

 Another relevant issue to be examined is the row-by-row variations of the Nusselt number. (... изменение числа Нуссельта от ряда к ряду)