The fuel burner of an open - hearth furnace is water-cooled, as is the valve that regulates the flow of air and waste gases.是什么意思_The fuel burner of an open - hearth furnace is water-cooled, as is the valve that regulates the flow of air and waste gases.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句