题目内容

The weather conditions required for flight under IFR are known as ______.

A. IMC
B. VMC
C. IFR
D. VRF

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The most important concept of IFR flying is _____.

A. distance
B. altitude
C. separation
D. visibility

A flight clearance is based on all the following but ______.

A. route
B. altitude
C. time
D. destination

In controlled airspace, _____ separates aircrafts from obstacles.

ATC
B. pilots
C. dispatchers
D. mechanics

ATC monitors IFR flights by relying either on _____ or aircraft position reports.

A. radar
B. instruments
C. sensations
D. visual references