题目内容
The procedural control requires that aircraft ________ by greater distances.
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In the oceanic areas, because of separation, the overall capacity of a given route is ______.
The procedural control uses the following information but _______ to ensure separation.
Air traffic control provides traffic ______ services to the aircraft on a time permitting basis.
The aircraft must be placed in a flow _________ the aircraft’s route of flight.
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