国产男女无遮挡猛进猛出_成年人爽片_亚州精品中文_岳狂躁岳丰满少妇大叫_《女按摩师》电影_男人的j插女人的p_91精品一区二区三区久久_一本大道久久a久久综合婷婷_亚洲欧洲一二三区_日韩av一二三四区在线观看

Optical curve grinder is used to grind precision and complex surfaces, including straight lines, arcs, and curves. During the grinding process, the workpiece and grinding wheel can be magnified 50 times by an optical system and projected onto a screen. During work, the operator can observe the grinding wheel processing along the workpiece surface on the screen at any time. The movement of the workpiece can be manually operated or controlled by a DC motor to achieve the purpose of processing the surface.