题目内容
A mechanical free-fall mechanism can disengage the_____.
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It is _____ in mechanical free-fall mechanism that forces the landing gear to fall.
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.
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