题目内容

词汇与结构The flaps and _________ are high lift devices that increase wing lift and decrease stall speed during takeoff, low speed maneuvering and landing.

A. elevators
B. rudder
C. ailerons
D. slats

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词汇与结构To prevent excessive structural loads from increased Mach at higher altitude, flap _________ above 20,000 feet should not be attempted.

A. deflection
B. extension
C. retraction
D. modification

词汇与结构Before the airplane begins to move, thrust must be _____.

A. exerted
B. reduced
C. increased
D. maintained

词汇与结构As long as the thrust continues to be greater than the drag, the airplane continues to _____.

A. decelerate
B. advance
C. move
D. accelerate

词汇与结构When drag equals thrust, the airplane flies at a _____ airspeed.

A. changeless
B. constant
C. same
D. fixed