题目内容

During flight under IFR, there are no requirements for _______, and as such flying through clouds is permitted.

A. altitude
B. stability
C. visibility
D. moisture

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En-route air traffic controllers ______ clearances and instructions for airborne aircraft.

A. give
B. issue
C. pass
D. send

The higher altitude allows a flight crew to start a climb earlier in case landing is _______.

A. possible
B. feasible
C. unfeasible
D. necessary

Aircraft approaching from the north must make visual contact with the airport at a ______ altitude than a flight approaching from the south, because of rapidly rising terrain south of the airport.

A. lower
B. same
C. higher
D. different

The minimum conditions for the aircraft to take off and land vary according to the type of navigation aids available, the location and height of terrain and obstructions _________ of the airport, etc.

A. in the front of
B. at the center of
C. in the vicinity of
D. at the back of