题目内容
In controlled airspace, _____ separates aircrafts from obstacles.
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ATC monitors IFR flights by relying either on _____ or aircraft position reports.
Aircraft position reports are traditionally sent as _______ transmission.
A flight operating under IFR is required to fall back to ______ if advised radar contact lost.
When flying over the thunderstorms, the aircraft may ______ CAT above the cloud.
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