液压是指升降机在升降过程中的动力来源及传动方式，液压传动固然离不开最重要的部位—液压油缸。
Hydraulic pressure refers to the lift in the process of power source and transmission, hydraulic transmission is the most important part of the hydraulic cylinder.
车载式轮椅自动升降机在动力的选择方面，可以采用液压传动、气压传动、电动推杆和电机等方式。
On the choice of power, the vehicle mounted wheelchair can use hydraulic drive, pneumatic drive, electric push rod and electric motor.
船用升降机动力学性能分析一直以来都是升降机领域的一个薄弱环节。
The dynamic characteristic analysis of ship lifter has always been a weak part of the lifter field.
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