A.V-shaped ripple with the point of the V pointing upstream
B.V-shaped ripple with the point of the V pointing downstream
C.small patch of smooth water on a windy day
D.smoothing out of the vessel's wake
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A.administer oxygen
B.immediately check his pulse and start CPR
C.make the victim comfortable in a bunk
D.immediately give a stimulant，by force if necesssary
A.perform the Heimlich maneuver
B.make the victim lie down with the feet elevated to get blood to the brain
C.immediately administer CPR
D.do nothing until the victim becomes unconscious
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You are approaching another vessel and see that it has the signal flag “O” hoisted．What is your next action（）.
The key to rescuing a man overboard is（）.
Generally speaking，the most favorable bottom for anchoring is（）.
（）is a/an aircraft used in SAR.
If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.