A controller should pass ATC route clearance to a pilot at the time _______ .
A.after takeoff
B.before takeoff
C.before start up
D.during the taxi
正确答案是C
A controller should pass ATC route clearance to a pilot at the time _______ .
A.after takeoff
B.before takeoff
C.before start up
D.during the taxi
正确答案是C