题目内容
Roughly, these ranges can be grouped in three categories: low-speed flight, _____ flight, and high-speed flight.
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If thrust decreases and airspeed decreases, lift becomes less than weight and the airplane will start to _____.
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.
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.
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