A description has been made on a structure and principle of progressive die used on a general press for shear,upsetting and automatic feed used for forming small axial parts.是什么意思_A description has been made on a structure and principle of progressive die used on a general press for shear,upsetting and automatic feed used for forming small axial parts.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句