Airport Engineering
The meteorological condition which influences the size and location of an air port is

Air density
Reduced level
Atmosphere pressure
All listed here

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Airport Engineering
Effective length of a runway is the distance between

Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway
Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway
Ends of the clear way on either side
Ends of the runway

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