Readback procedure is not a necessity for_______.
A.maneuvers related to the runway-in-use
B.heading and speed instructions
C.level instructions, altimeter settings and SSR codes
D.wind direction and speed
正确答案是D
Readback procedure is not a necessity for_______.
A.maneuvers related to the runway-in-use
B.heading and speed instructions
C.level instructions, altimeter settings and SSR codes
D.wind direction and speed
正确答案是D