单项选择题

An immersion suit should be equipped with a/an（）.

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

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单项选择题

A.air bottle for breathing
B.orange smoke canister
C.whistle，light and retroreflective material
D.sea dye marker

单项选择题

A.percentage of frequency of wave heights
B.percentage of poor visibility conditions
C.sea surface temperatures
D.amounts of precipitation

单项选择题

A.the altitude above sea level
B.the season of the year
C.the latitude or distance from the equator
D.All of the above