It is occasionally necessary to cancel the takeoff clearance due to _______ .
A.unexpected traffic developments
B.a departing aircraft delayed on the active runway
C.an imminent 1anding traffic
D.any condition listed above
正确答案是D
It is occasionally necessary to cancel the takeoff clearance due to _______ .
A.unexpected traffic developments
B.a departing aircraft delayed on the active runway
C.an imminent 1anding traffic
D.any condition listed above
正确答案是D