单选题On an OSV，when may a work vest be substituted for a required life jacket?（）ATo replace a damaged life jacketBFor use during fire drillsCFor use during boat drillsDAt no time
单选题
On an OSV，when may a work vest be substituted for a required life jacket?（）
A
To replace a damaged life jacket
B
For use during fire drills
C
For use during boat drills
D
At no time
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