friction pressure loss ; frictional pressure loss
摩擦阻力损失压头 friction resistance head
流体摩擦阻力损失压头 [机] head of fluid frictinal loss
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给出了测取液压抽油机系统压力损失、流量损失以及油缸的摩擦力损失等的方法，并由此求出系统的机械效率与容积效率。
The test method of pressure loss, flow loss and frictional force loss etc. of the hydraulic pumping units is presented, from which the mechanical efficiency and volumetric efficiency are obtained.
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