题目内容
To prevent excessive structural loads from increased Mach at higher altitude, flap _________ above 20,000 feet should not be attempted.
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Before the airplane begins to move, thrust must be _____.
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.
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