The preferred agent used in fighting a helicopter crash……

单项选择题The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.

A.45°upward
B.vertically upward
C.vertically downward
D.all of the above

单项选择题The muster list shows each rig hand’s muster station，his duties during abandonment，basic instructions，and（）.

A.all emergency signals
B.instructions for lowering the survival craft
C.the time each weekly drill will be held
D.work schedule

单项选择题Small oil spills on deck can be kept from going overboard by（）.

A.driving wooden plugs into the vents
B.closing the lids on the vents
C.plugging the scuppers
D.plugging the sounding pipes

单项选择题Seeing that all hands are familiar with their duties，as specified in the muster list，is the responsibility of the（）.

A.Master
B.Chief Mate
C.safety officer
D.department heads

单项选择题An inflatable liferaft is thrown into the water from a sinking vessel. What occurs automatically after the painter trips the CO2 bottles to inflate the raft?（）

A.The sea anchor deploys
B.The floor inflates
C.If upside down，the craft rights itself
D.The painter detaches from the raft