This paper describes the structure and forming method of the pipe blank, structure of die, process flow, once-forming method of big end and small end of the reducer and integral once-forming method.是什么意思_This paper describes the structure and forming method of the pipe blank, structure of die, process flow, once-forming method of big end and small end of the reducer and integral once-forming method.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句