单项选择题
A.fire hose might be damaged by cargo operations
B.vessel is in port
C.fire-main system is not charged
D.fire pumps are used for purposes other than supplying water to the fire main
单项选择题 If you are fighting a fire below the main deck of your vessel，which action is most important concerning the stability of the vessel?（）.
单项选择题 It is necessary to secure the forced ventilation to a compartment where there is a fire to（）.
单项选择题 At the required fire drill conducted aboard a vessel，all persons must report to their stations and demonstrate their ability to perform the duties assigned to them（）.