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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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，a fire drill shall be conducted once every（）.

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