题目内容
Belly landings are one of the most common types of aircraft accidents, and are normally not fatal if _____ carefully.
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A_____ pilot may neglect the gear-up warning lights.
An alternative system uses the _____ to engage a warning when the airplane is close to the ground and descending with the gear not down.
Pilots have sometimes _____ the landing gear warning horn with the stall warning horn.
Two pilots working as a team provides a sort of human _____ which reduces the workload placed on any one crew member.
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