By using VOR and DME, a pilot knows he is on the correct course and his _______ to the VOR/DME station.
A.position
B.level
C.speed
D.distance
正确答案是D
By using VOR and DME, a pilot knows he is on the correct course and his _______ to the VOR/DME station.
A.position
B.level
C.speed
D.distance
正确答案是D