题目内容

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

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

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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

______ is a backup system providing a last layer of defense if a sequence of errors or omissions causes a dangerous situation.

A. TAWS
B. EFIS
C. GPS
D. EICAS