题目内容
When the area is not covered by the long range radar, the centers may also use _______ data to control the aircrafts.
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ACC may require numerous radar systems to cover the airspace assigned to them, and may also rely on _______ from aircraft flying below the floor of radar coverage.
The ocean areas are also _______.
Oceanic controllers provide ATC services using _______.
The procedural control requires that aircraft ________ by greater distances.
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