久久精品国产亚洲av香蕉色,伊人久久大香线蕉综合观,日本午夜电影中文字幕,亚洲中文字幕人妻一区二区,人妻秘书一乃葵久久精品综合,中午国产在线观看内射,国产成人精品午夜一区二区三区,av黄色片网站免费,日韩最新偷拍一区二区,青青草视频手机在线观看视频免费

Precision machining is a machining method with machining accuracy up to 1 micron. Precision machining method mainly includes fine turning, fine boring, fine milling, fine grinding and grinding technology. Under strictly controlled environmental conditions, the use of precision machine tools and precision measuring tools and measuring instruments to achieve. Machining accuracy of 0.1 micron or more is called ultra precision machining. In the aerospace industry, precision machining is mainly used to process precision mechanical parts in aircraft control equipment, such as hydraulic and pneumatic servomechanics.