Such combustible gases produced in the course of industrial production as coke oven gas, blast furnace gas, and gases released at a steady rate from coal mines and synthetic ammonia should be recycled and utilized.

• 工业生产中产生的焦炉煤气、高炉煤气和稳定抽放的煤矿瓦斯、合成氨驰放气等可燃性气体应当回收利用。