Before lining up, the pilot should switch to tower control _______ .
A.when instructed by the ground control
B.before lining up on the runway
C.after lining up on the runway
D.on leaving the taxiway
正确答案是A
Before lining up, the pilot should switch to tower control _______ .
A.when instructed by the ground control
B.before lining up on the runway
C.after lining up on the runway
D.on leaving the taxiway
正确答案是A