单项选择题
Any vessel in need of carrying out deck washing must be（）by the department concerned beforehand.
A.requested
B.allowed
C.approved
D.inquired
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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
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C.Group illness
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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
D.prime the air supply
