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为什么飞机需要升降舵控制飞行姿态？

飞机需要升降舵控制飞行姿态是因为升降舵可以改变飞机的升力和下降力，从而调整飞机的姿态和俯仰角度。通过改变升降舵的角度，飞行员可以控制飞机的升降运动，以维持飞机的水平飞行或者进行爬升和下降。升降舵的使用使得飞机具备了更好的操纵性和飞行稳定性。

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