单项选择题
How many adult life jackets are required on board a ship?（）
A.Enough for 100 percent of the persons allowed on board
B.One for each work station and industrial work site
C.Enough for 150 percent of the persons allowed on board
D.Both A and B above
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Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.
A.at work
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Each life jacket light that has a non-replaceable power source must be replaced（）.
A.every 6 months after initial installation
B.every 12 months after initial installation
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D.on or before the expiration date of the power source
