Which space(s) on your cargo vessel must have a fire detection system?（）

单项选择题Which precaution should be taken when testing a line throwing gun?（）

A.Never remove the line from the rocket
B.Fire it at an angle of approximately 90 degrees to the horizon
C.Wear asbestos gloves
D.All of the above

单项选择题Which portable fire extinguisher should be used on a class C fire on board a vessel?（）

A.Carbon dioxide
B.Water (stored pressure)
C.Foam
D.Carbon tetrachloride

单项选择题Which portable fire extinguisher is normally recharged in a shore facility?（）

A.Dry chemical (cartridge-operated)
B.Water (cartridge-operated)
C.Water (pump tank)
D.Carbon dioxide

单项选择题Which item is NOT included in the fireman’s outfit on a cargo vessel?（）

A.Fire ax
B.Flashlight
C.rigid helmet
D.Fresh air breathing apparatus

单项选择题Which is a disadvantage of Halon as a fire extinguishing medium?（）

A.Conducts electricity
B.Difficult to store
C.Large volume necessary to be effective
D.Ineffective in powdered metal fires