单项选择题
A survival craft being used to pick up a person who has fallen overboard from a vessel should approach the person（）.
A.at a high rate of speed
B.under oars
C.against the wind
D.with the wind
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A snag or other underwater obstruction may form a（）.
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 shipmate suffers a heart attack and stops breathing. You must（）.
A.administer oxygen
B.immediately check his pulse and start CPR
C.make the victim comfortable in a bunk
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A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
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
