相关题目
The contour on the map is the line joining （ ） at the same altitude.
（ ） is a radar system which uses reflected radio signals.
（ ） is the visibility at an aerodrome, as reported by an accredited observer.
（ ） is the visibility forward from the cockpit of an aircraft in flight.
（ ） is specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft.
The flight plan as filed with an ATS unit by the pilot or his designated representative, without any subsequent changes is called （ ） .
（ ） is the pilot responsible for the operation and safety of the aircraft during flight time.
（ ） is a power-driven heavier-than-air aircraft, deriving its lift in flight chiefly from aerodynamic reactions on surfaces which remain fixed under given conditions of flight.
（ ） is a group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the A/C call sign to be used in air-ground communications, and which is used to identify the A/C in ground-ground air traffic services communications.
（ ） is a group of alphanumeric characters used to identify an aircraft in air-ground communication.
