Table for the hydraulic control longitudinal movement.
工作台纵向移动为液压控制。
It is necessary to study shipping longitudinal movement and realize effective control.
研究船舶纵向运动从而实现有效控制是非常必要的。
This invention discloses a sewing machine having stem to be driven to perform longitudinal movement; wherein the stem can be fixed with sewing needle for guiding threads.
本发明涉及一种缝纫机，该缝纫机具有可驱动以上下运动的针杆，该针杆上可固定缝纫针以用于引导针线。
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