This paper introduces the function of the chemical element of VN in themicroalloyed steels and the most economic, dependable method of V steel add N.是什么意思_This paper introduces the function of the chemical element of VN in themicroalloyed steels and the most economic, dependable method of V steel add N.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句