The pilot-in-command shall _______ a flight plan to the relevant ATC unit at least one hour before the estimated time of departure.
A.submit
B.send
C.fill
D.transmit
正确答案是A
The pilot-in-command shall _______ a flight plan to the relevant ATC unit at least one hour before the estimated time of departure.
A.submit
B.send
C.fill
D.transmit
正确答案是A