题目内容
The flaps and _________ are high lift devices that increase wing lift and decrease stall speed during takeoff, low speed maneuvering and landing.
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To prevent excessive structural loads from increased Mach at higher altitude, flap _________ above 20,000 feet should not be attempted.
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.
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