题目内容
Actually, the airplane could not continue to travel in level flight at a constant altitude and maintain the same angle of attack if the _____ is increased.
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This is normally accomplished by reducing the angle of attack, i.e., _____ the nose.
There is, of course, a limit to how far the angle of attack can be increased, if a _____ is to be avoided.
Lift and drag also vary directly with the _____ of the air.
Warm air is less dense than cool air, and _____ air is less dense than dry air.
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