题目内容
In the event of failure of power system, an emergency extension system is always _____.
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In case the power system fails, pilots may manually operate a _____ or pump to extend the landing gear.
A mechanical free-fall mechanism can disengage the_____.
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.
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