单项选择题
A.air bottle for breathing B.whistle and hand held flare C.whistle，strobe light and reflective tape D.whistle，hand held flare and sea dye marker
A.air bottle for breathing B.orange smoke canister C.whistle，light and retroreflective material D.sea dye marker
A.percentage of frequency of wave heights B.percentage of poor visibility conditions C.sea surface temperatures D.amounts of precipitation