The control of air traffic on, or in the vicinity of an aerodrome, is provided by _______ .
A.the area control
B.the approach
C.the ground
D.the control tower
正确答案是B
The control of air traffic on, or in the vicinity of an aerodrome, is provided by _______ .
A.the area control
B.the approach
C.the ground
D.the control tower
正确答案是B