When is a traffic advisory issued?
2023-12-01选择题 教员版 下
When is a traffic advisory issued?
A.A.When the other aircraft is within 20 NM
B.B.When the aircraft is within 20 seconds of the closest approach.
C.C.When the other aircraft is within 40 NM.
D.D.When the aircraft is within 40 seconds of the closest approach.
正确答案是D
