题目内容
It is _____ in mechanical free-fall mechanism that forces the landing gear to fall.
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In the event of failure of only one landing gear _____ , the pilot may choose to retract all the gear.
A belly landing needs to be _____ when pilots fail to extend the landing gear.
When the airplane _____ the ground during landings, its vertical speed is instantly reduced to zero.
The purpose of pneumatic tires and shock absorbing landing gears is to _____the impact when the airplane touches the runway.
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