A.at a high rate of speedB.under oarsC.against the wind……

单项选择题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

单项选择题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

单项选择题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

单项选择题A ship must have on board a first-aid kit that is approved by the（）.

A.Minerals Management Service
B.Occupational Safety and Health Administration
C.Mine Safety and Health Administration
D.American Bureau of Shipping

单项选择题A seaman is reported missing in the morning and was last seen after coming off the mid-watch. Which type of turn would you use to return to the trackline steamed during the night?（）

A.Williamson
B.Racetrack
C.180°turn
D.Anderson