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。
It is introduced about the feature and structure of the fast tool lowering device for supersonic vibration turning.
介绍了超声振动车削快速落刀装置的性能和结构。
Introduces the character, fundamental, technological process and system layout of jet well ground water lowering device.
简要介绍了射流井点降水装置的特点、基本原理以及装置的工艺流程及系统布置。
Introduces the character, fundamental, technological process and system layout of jet well ground water lowering device.
简要介绍了射流井点降水装置的特点、基本原理以及装置的工艺流程及系统布置。
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