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单选题
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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考题
单选题On a ship，when may a work vest be substituted for a required life preserver?（）A
To replace a damaged life preserverB
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Following a satisfactory installation test on board the ship the Surveyor will issue a Program Installation TestD
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