The fuel used for heating is either blast furnace gas or coke oven gas. The combustion air is always preheated to improve fuel utilization.是什么意思_The fuel used for heating is either blast furnace gas or coke oven gas. The combustion air is always preheated to improve fuel utilization.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句