Two flow sheets i.e. acetonitrile (ACN) method and dimethyl formamide (DMF) method for separating butane and butene are described.是什么意思_Two flow sheets i.e. acetonitrile (ACN) method and dimethyl formamide (DMF) method for separating butane and butene are described.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句