题目内容

词汇与结构The aircraft take advantage of aerodynamic _________ to travel through the air by means of primary and secondary flight control surfaces which are operated by flight controls in the cockpit.

A. loads
B. sources
C. abilities
D. forces

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词汇与结构Flap 15 is normally limited to airports _________ approach climb performance is a factor.

A. where
B. when
C. which
D. that

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

A. To reduce
B. To protect
C. To prevent
D. To eliminate

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A. choosing
B. making
C. selecting
D. planning

词汇与结构When higher forces are required to generate sufficient elevator control to flare for landing, stabilizer trim is available to _________ the sustained control column force.

A. counteract
B. compensate
C. replace
D. eliminate