This usually means more processes-a cracking process to change an excess of heavy fuel oil into more gasoline with coke as the residual product to accommodate the ever-changing demands of the market.

• 一般而言，这意味着需要更多的工艺以适应不断变化的市场需求：运用裂化工艺将过剩重燃料油转化成汽油，而焦碳成为残余品；