题目内容
Before the airplane begins to move, thrust must be _____.
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As long as the thrust continues to be greater than the drag, the airplane continues to _____.
When drag equals thrust, the airplane flies at a _____ airspeed.
Roughly, these ranges can be grouped in three categories: low-speed flight, _____ flight, and high-speed flight.
If thrust decreases and airspeed decreases, lift becomes less than weight and the airplane will start to _____.
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