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.
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