题目内容

Small aircraft are equipped with warning lights to _____ the status of the landing gear.

A. intend
B. predicate
C. symbolize
D. indicate

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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.

A. black
B. blue
C. amber
D. pink

There are warning systems on large aircraft to show whether the landing gear is up, in _____, or down.

A. transform
B. translate
C. transit
D. transfer

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.

A. horn
B. sensor
C. monitor
D. loudspeaker

Most airliners _____warning lights and horns.

A. introduce
B. implement
C. integrate
D. incorporate