国产av一区二区电影,人妻,少妇无码,日本六九视频在线观看,中文字幕九条满,欧美日韩亚洲国内综合网国产精品v日韩精品v欧美精品欧美v亚洲v日韩v,草日比在线国产,中国中国中国中国东京热东京热东京热东京热色妞网站

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.