The radar controller should advise the aircraft of its position _______ prior to commencement of final approach.
A.two times
B.only once
C.at least once
D.continuously
正确答案是C
The radar controller should advise the aircraft of its position _______ prior to commencement of final approach.
A.two times
B.only once
C.at least once
D.continuously
正确答案是C