单项选择题
A.using a 2-1/2 inch hose
B.there is an outlet for the smoke and heat
C.the fire is totally contained by the ship's structure
D.at least two fog streams can be used
单项选择题 A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.
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（）.