单项选择题
Fire protection and manning regulations for towing vessels state that the Master or person in charge must ensure that all crew members who have not participated in the drills or received the safety orientation（）.
A.receive a safety orientation or view a videotape before the vessel gets underway
B.view a videotape on safety procedures within 48 hours of reporting for duty
C.receive a safety orientation within 24 hours of reporting for duty
D.none of the above
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Fire may be spread by which means?（）
A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above -
单项选择题
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
A.completely closing the compartment
B.closing the compartment except for the ventilators
C.leaving the compartment open to the air
D.increasing the air flow to the compartment by blowers -
单项选择题
Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.
A.used for electrical fires only
B.the smallest
C.the most accessible
D.the most effective
