题目内容
An alternative system uses the _____ to engage a warning when the airplane is close to the ground and descending with the gear not down.
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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.
_____, is the same as a crash landing, only on water.
The _____ is the gentle settling of the airplane onto the landing surface.
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