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

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单项选择题

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

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

单项选择题

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