A、A.every 6 months after initial installation
B、B.every 12 months after initial installation
C、C.every 24 months after initial installation
D、D.on or before the expiration date of the power source
更多“Each life jacket light that has a non-replaceable power source must be replaced（）.”相关的问题
A、the life-jackets and carry the belongings first. B、the life-jackets and carry the lifebuoys first C、the life-jackets and gather at muster station first D、the life-jackets and call the captain.
A、when the power source is replaced B、each year after installation C、every six months D、when it is no longer serviceable
A、To replace a damaged life jacket B、For use during fire drills C、For use during boat drills D、At no time
A、A. release a lifebuoy B、B. release a life-jacket C、C. release a lifeboat D、D. release a life-raft
A、One ring life buoy B、One ring life buoy on each side of the ship C、Three ring life buoys D、Two ring life buoys on each side of the ship
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