单项选择题
A.be the best thing to try if there was no rescue in sight
B.increase survival time in the water
C.increase the rate of heat loss from the body
D.not affect the heat loss from the body
单项选择题 In each inflatable rescue boat，what piece of equipment is provided to make quick，emergency，temporary repairs to a large hole in a raft?（）.
单项选择题 Unless it is unavoidable do not jump from a place higher than 5 meters into the water． Try to minimize the shock of sudden cold immersion． When should the said caution be taken into account?（）.
单项选择题 I have lost a man overboard． Please help（）search and rescue.