The vacuum system process of PET unit,the design of EG steam ejector shape and support,the selection of support spring and the main points in the ejector pipe design are introduced.是什么意思_The vacuum system process of PET unit,the design of EG steam ejector shape and support,the selection of support spring and the main points in the ejector pipe design are introduced.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句