Screw pump features: the loss of small screw pump, good economic performance.
螺杆泵特点为：螺杆泵损失小，经济性能好。
Ball screw due to high movement efficiency, small heat, it can achieve high-speed feed (motion).
滚珠丝杠由于运动效率高、发热小，故可实现高速进给(运动)。
Screw is small, its role is not estimated.
螺丝钉虽小，其作用是不可估计的。
Results Operation time and bleed were obviously short and small in screw-rod systems.
术后钉-棒系统断棒、失代偿及假关节的发生明显低于前两组。
Results Operation time and bleed were obviously short and small in screw-rod systems.
术后钉-棒系统断棒、失代偿及假关节的发生明显低于前两组。
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