单项选择题
An obstruction on a helideck is any object that might present a hazard to the（）.
A.rotor blades and landing gear
B.unloading of passengers
C.loading of cargo
D.pilot's visibility
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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 -
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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
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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
