题目内容
To _____ the ambiguity of a horn or buzzer, a voice message system is used in most airliners.
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The _____ of advanced warning systems and effective crew training has made gear-up landing accidents in large aircraft extremely rare.
In the event of failure of power system, an emergency extension system is always _____.
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_____.
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