The vaccum system composition of PET plant in Urumqi Petrochemical Company were introduced,including EG circulation,booster pump and EJ spray.是什么意思_The vaccum system composition of PET plant in Urumqi Petrochemical Company were introduced,including EG circulation,booster pump and EJ spray.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句