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变桨距（Variable pitch）是指飞机螺旋桨的叶片可以在飞行中改变其角度的能力。这种能力可以帮助飞机更好地控制飞行性能，例如在升降、加速或减速时。变桨距是在 20 世纪初期发明的，当时飞机发动机的功率还不够强大，因此飞机在升降或加速
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