飞机在地面效应区内时，为产生与地面效应区外相同的升力，相同表速情况下需要（）.
A.较小的迎角
B.相同的迎角
C.较大的迎角
参考答案：A
13. In order to _____ the development of the west of our country, many special policies have been made, such as encouraging people to go to work in the west.
A．accelerate
B．accomplish
C．acknowledge
D．Accompany
简述刮板输送机的主要类型。
