单项选择题
An immersion suit must be equipped with a(n)（）.
A.air bottle for breathing B.orange smoke canister C.whistle，light and retroreflective material D.sea dye marker
单项选择题 All of the following can be found on a Pilot Chart EXCEPT information concerning the（）.
单项选择题 Air temperature varies with（）.
单项选择题 After a liferaft is launched，the operating cord（）.
