欧美日韩亚洲另娄_黄色录像成人播放免费_黄视频免费看不卡_污18禁污色黄网站_亚洲AV天海翼一级毛片_国产人成精品_亚洲熟女少妇乱小说区_久久精品青青草原伊人_国产性生活爱视频_99热这里只有精品免费播放

Metal cutting tools are an essential part of the modern industrial economy. In various fields of the economy, they play a fundamental and strategic role. They are the core components to fulfill machine functions, referred to as the tooth of industry. Products are widely used in the light industry, equipment manufacturing, construction and building materials, automobile manufacturing, electronic information, aerospace, and other industries. Metal cutting tools are an important symbol of comprehensive technical strength for industrialized countries.