1. [单选题]Which of the following represents the significance the fuel oil cetane number?
A. The cetane number has no affect on injection lag
B. The cetane number is an indication of the fuel's viscosity
C. Ignition lag is reduced with fuels having a high cetane number
D. The cetane number is of little significance in the combustion process
2. [单选题]轮机长必须_______定时认真查阅《轮机日志》的记载情况，对各栏目内的内容进行审核，确认无误后签字。
A. 每班
B. 每半天
C. 每日
D. 每周
3. [单选题]提高船舶抗沉性的主要方法有______。
A. 增设水密舱室
B. 增设尽可能多的横隔舱壁
C. 设双层底或双层船壳
D. 增加干舷高度
