题目内容
The warning lights on small retractable landing gear aircraft may change colors from red to _____ to green depending on the different statuses of the landing gear.
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There are warning systems on large aircraft to show whether the landing gear is up, in _____, or down.
Warning light and _____operate when any of the landing gear is not locked down and any of the engine throttles are retarded below a cruise power setting.
Most airliners _____warning lights and horns.
A voice message system on some aircraft may give a clear _____ warning indication.
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