题目内容
______ is a backup system providing a last layer of defense if a sequence of errors or omissions causes a dangerous situation.
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In the United States even when on a filed IFR flight plan, if conditions permit the _______ is responsible to maintain a watch for, and avoid other air traffic and obstructions.
Which one is not included in the radio beacons on the ground?
In areas of radar coverage, ATC may assign ________ to IFR aircraft, also known as radar vector.
_______ is the primary method for ATC to provide separation between aircrafts for landing.
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