Surface treatment: Apply the surface treatment techniques like polishing, acid treatment and passivation to treat the welding line, hole, screw to ensure that the surface meets the GMP standards.

• 表面处理技术：采用相应的加工工艺，对工件表面进行抛光、磨砂、酸洗，钝化等工艺，对焊缝、内孔、螺纹、紧固结构等采取相应的手段，以保证表面状态符合gmp规范中的相关要求。