单项选择题
On a ship，when may a work vest be substituted for a required life preserver?（）
A.To replace a damaged life preserver
B.For use during fire drills
C.For use during boat drills
D.At no time
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相关考题
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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
