题目内容

With four dimensional approach clearances for commercial aircraft, _______ is the fourth dimension.

A. time
B. altitude
C. speed
D. direction

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Ground Control is responsible for the airport "movement" areas, as well as areas not _____to the airlines or other users.

A. borrowed
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52.An airport includes all taxiways, inactive runways, holding areas, and some transitional aprons or intersections where aircraft arrive, having _____the runway.

A. left
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C. started
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A. clearance
B. permitted
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A. another
B. additional
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D. vital