Demand shocks have come from sudden policy decisions to increase biofuel content in gasoline, for example.
需求的波动则来自于，比如说，增加生产生物燃料的政策。
2
Heavy oil recovery rate can be increased and gasoline olefin hydrocarbon content can be decreased effectively by catalytic cracking operation parameters optimization.
通过优化催化裂化装置的操作参数可有效提高重油转化率和降低汽油烯烃含量。
3
It has been used as an alternative of gasoline, improvers for octane number and oxygen content in gasoline.