介绍了双活塞液压缸的研制及应用，与单活塞液压缸相比，它具有动作快速、灵活等优点，特别适合在需要快速提供强大推力或拉力的场合。
Compared to single piston cylinder, it features fast action and flexibility, specially used when large thrust force or tensile force is required within short time.
本文分析装置模型的动作机理，确定系统中沉排绞车拉力、速度最佳参数，并就改善工况运行条件的体系结构作了较深入的探讨。
This paper analyses the operation principle of the device model, determines the value of the pull force of sinking mattress winch and the optimum speed parameter of the system.
膝关节损伤在太极拳运动中较常发生，它的损伤与太极拳运动的姿势、技术动作、下肢肌肉的收缩力和韧带的牵拉力等因素有密切关系。
Knee joint injury often occurs in hexagram boxing exercises. It is closely related to the movement posture and skills, the contraction of leg muscles and the traction of ligamem, etc.
拉力调校：根据使用者体重而作出适当的拉力调节，令倾仰动作更顺畅。
Tension Control: It Controls the Tension Needed According to Different Users' Weights When Leaning Backwards or Forwards.
受架空输电导线拉力的影响，导线在夹持区易出现应力集中现象，在微风振动作用下，夹持区易产生疲劳断股破坏。
Therefore, the wire in the clamping region is prone to be damaged because of aeolian vibration of overhead transmission lines.
受架空输电导线拉力的影响，导线在夹持区易出现应力集中现象，在微风振动作用下，夹持区易产生疲劳断股破坏。
Therefore, the wire in the clamping region is prone to be damaged because of aeolian vibration of overhead transmission lines.
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