“Contact 121.3 when _______” means that the pilot should contact 121.3 after departure.
A.ready
B.airborne
C.take off
D.departure
正确答案是B
“Contact 121.3 when _______” means that the pilot should contact 121.3 after departure.
A.ready
B.airborne
C.take off
D.departure
正确答案是B