On a ship，when may a work vest be substituted for a required life preserver?（）<br>A:To replace a damaged life preserver<br>B:For use during fire drills<br>C:For use during boat drills<br>D:At no time

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

出自：海船船员证

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