An obstruction on a helideck is any object that might p……

单项选择题AN ILLNESS PREFERABLY OF AN INFECTIOUS NATURE SEIZING MORE THAN TWO PERSONS ON BOARD AT THE SAME TIME defines（）.

A.Disease of Crew
B.Crew illness
C.Group illness
D.Mass disease

单项选择题Aboard a survival craft，ether can be used to（）.

A.start the engine in cold weather
B.aid in helping personnel breathe
C.prime the sprinkler system
D.prime the air supply

单项选择题A towline should be fastened to（）.

A.the chocks at the bow of a towed vessel
B.the most forward，centermost point of a towed vessel such asa sturdy bow rail
C.the mast of a towed sailboat
D.a secure fitting near the bow of the towed vessel

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 right-handed propeller will cause the survival craft to（）.

A.walk the stern to starboard in reverse
B.walk the stern to port in reverse
C.run faster than a left-handed propeller
D.right itself if capsized