题目内容
按照机床的工作精度分类，可以把机床分为普通精度机床、精密机床和高精密机床。
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When angle of attack increases, lift increases correspondingly.
Lift is inversely proportional to the square of the airplane’s velocity.
If the airplane accelerates, it could not continue to keep a level flight with a constant height and keep the same angle of attack.
Lowering the nose can conversely increase lift.
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