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單項(xiàng)選擇題

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

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A person reports to you with a fishhook in his thumb. To remove it you should（）.

A.pull it out with pliers
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C.push the barb through，cut it off，then remove the hook
D.have a surgeon remove it

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（）is used for lifting cargo.

A.A mooring winch
B.A windlass
C.A deck crane
D.A lifeboat engine