單項(xiàng)選擇題

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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單項(xiàng)選擇題

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
D.immediately give a stimulant，by force if necesssary

單項(xiàng)選擇題

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

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A snag or other underwater obstruction may form a（）.

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A shipmate suffers a heart attack and stops breathing. You must（）.

A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.

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A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.