单项选择题
A.requested B.allowed C.approved D.inquired
An obstruction on a helideck is any object that might p...
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
AN ILLNESS PREFERABLY OF AN INFECTIOUS NATURE SEIZING M...
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
Aboard a survival craft，ether can be used to（）.A.start ...
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
