水压抽水机A hydraulic ram 他们详细地教给农民怎样保养抽水机。They tell the peasants in detail how to maintain the pumps.
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Others from V or X shapes. Some canopies are a single piece and some are two pieces with a hydraulic ram at the hinge-joint.
另从V或X形。一些檐篷是一个单一的作品，有些是两件与液压内存在铰链联合。
A control method for ram position of a hydraulic press and the component of the control system are presented. By means of this method, the ram position can accurately be controlled.
介绍一种液压机滑块位置控制方法及其系统组成，采用该方法能够实现液压机滑块位置的精确控制。
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