The lifting and lowering device can adopt the hydraulic pressure mode as well as the mechanical mode.
升降装置可采用液压方式，也可以是机械方式。
The positioning apparatus also includes a lifting device for raising and lowering the outer cylinder. The lifting device includes a threaded drive mechanism coupled to the piston.
所述定位装置还包括用于升高和降低所述外气缸的提升装置，所述提升装置包括与所述活塞相连的带螺纹驱动机构。
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