It has enough energy to overcome the frictionalresistance in valves and registers.
它有足够的能量克服阀门和记录器的摩擦阻力。
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Viscosity: viscosity is the crude oil in the flow caused by the internal frictionalresistance, crude oil viscosity depends on temperature, pressure, dissolved gas and its chemical composition.
This article discusses the changes in properties, in particular with regard to frictionalresistance and the enormous reduction in wear, which can be achieved by adding aramid to PA66.