安全系统工程的研究对象、内容及研究方法？

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

A. 正确
B. 错误