A.To replace a damaged life preserverB.For use during f……

单项选择题On a ship，watertight doors should be operated（）.

A.during abandon drill
B.during fire drill
C.weekly
D.when the rig is being moved

单项选择题On a ship，how many ring buoys are required to have a buoyant line attached?（）

A.One ring life buoy
B.One ring life buoy on each side of the ship
C.Three ring life buoys
D.Two ring life buoys on each side of the ship

单项选择题On a ship，firefighting equipment must be inspected once every（）.

A.three months
B.six months
C.twelve months
D.eighteen months

单项选择题On a ship，a fixed carbon dioxide or other approved system must be installed（）.

A.where oil or chemical drums are stored
B.in all battery storage locations
C.in paint lockers
D.in all of the above locations

单项选择题On a ship，a fire drill shall be conducted once every（）.

A.week
B.month
C.crew change
D.other week