Flaps increase lift by _______ .
A.increasing the wing’s effective camber
B.changing the chord line
C.increasing the area of the wing
D.all the above
正确答案是D
Flaps increase lift by _______ .
A.increasing the wing’s effective camber
B.changing the chord line
C.increasing the area of the wing
D.all the above
正确答案是D