单选题An obstruction on a helideck is any object that might present a hazard to the（）.Arotor blades and landing gearBunloading of passengersCloading of cargoDpilot's visibility
单选题
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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