_______ , also known as the best rate-of-climb airspeed, gives the greatest gain in altitude over a period of time during climb.
A.Vy
B.Vlo
C.Vx
D.Va
正确答案是A
_______ , also known as the best rate-of-climb airspeed, gives the greatest gain in altitude over a period of time during climb.
A.Vy
B.Vlo
C.Vx
D.Va
正确答案是A