An air show may with the consent of the _______ be the reason for an aerodrome being closed to all traffic for a few hours.
A.Control tower
B.ACC
C.Approach Control
D.proper authorities
正确答案是D
An air show may with the consent of the _______ be the reason for an aerodrome being closed to all traffic for a few hours.
A.Control tower
B.ACC
C.Approach Control
D.proper authorities
正确答案是D