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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Heavy fuel oils when spilled are（）.

A.more harmful to sea life than lighter oils
B.easier to clean up than lighter refined oils
C.less harmful to sea life than lighter oils
D.not a real threat to marine life

单项选择题

Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.

A.at work
B.in his or her berthing area
C.BOTH at work and in his or her berthing area
D.None of the above are correct

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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
C.every 24 months after initial installation
D.on or before the expiration date of the power source