石油化装置的火灾特点主要有几个方面？

A. aid in the stripping and cleaning of cargo tanks
B. increase the rate of discharge of cargo
C. force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere
D. lower the oxygen levels inside cargo tanks，making explosion nearly impossible

A. 双糖
B. 单糖
C. 饴糖
D. 蔗糖