相关题目
（ ） is a general term used to describe airspace in which approach control service or airport traffic control service is provided.
（ ） is the length of runway declared available and suitable for the ground run of an airplane taking off.
（ ） is the length of the takeoff run available plus the length of the clearway, if provided.
（ ） is a geographical location in relation to which the position of an aircraft, is reported.
（ ） is a route assigned to pilot when any part of an airway or route is unusable because of NAVAID status.
（ ） is the line-of-sight distance between two points not at the same elevation.
Red on color weather radar denotes （ ） .
（ ） is the intersection of lines of reference, usually expressed in degrees /minutes /tenths of minutes of latitude and longitude, use to determine position or location.
（ ） is the speed of an aircraft relative to the surface of the earth.
（ ） is the direction in which the nose of the airplane points during flight.
