When the aircraft is flying en-route, whether it is under the control of medium-and-low altitude control office or high altitude control office is dependent on the aircraft’s _______ .
A.type
B.cruising speed
C.flight altitude
D.flight range
正确答案是C
When the aircraft is flying en-route, whether it is under the control of medium-and-low altitude control office or high altitude control office is dependent on the aircraft’s _______ .
A.type
B.cruising speed
C.flight altitude
D.flight range
正确答案是C