单项选择题
A.one hour
B.two hours
C.ten hours
D.four hours
单项选择题 During the towing of a survival craft，a lookout should be on station to（）.
单项选择题 Coast Guard regulations require that all of the following emergencies be covered at the periodic drills on a fishing vessel EXCEPT（）.
单项选择题 Coast Guard regulations require a shipboard Oil Pollution Emergency Plan to be reviewed（）.