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单选题
在某些飞机上，ß角变化能够改变进近时的阻力，而在其它飞机上，它仅用于在地面上控制滑行和反推。
A
On some airplanes, a portion of the ß range may be used for drag control on approach, and on others, it is used only on the ground for taxi and reverse thrust control.
B
On some aircraft, a small range of blade mounting angles is used to control drag on approach, while on other aircrafts, it is used only on the ground to control taxiing and recoil.
C
On some aircraft, a part of the ß range is used to control thrust on approach, and on others, it is used mostly on the ground to control taxi and drag.
答案解析
正确答案：A
