词汇与结构In general, airframe vibrations can best be reduced by descending and ________ airspeed.
A. relieving
B. releasing
C. increasing
D. reducing
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词汇与结构After descending and reducing airspeed, the existing vibration level is unacceptable, and if it is impractical to further reduce airspeed, the vibration level may be_____ to a previous, lower level by a slight increase in airspeed.
A. relieved
B. released
C. decreased
D. reduced
词汇与结构Engine indications are ______ on the center instrument panel by the Engine Instrument System.
A. displayed
B. exhibited
C. spread
D. lost
词汇与结构When the round red warning light above the indicator is illuminated, it ______ the limit for the engine parameter displayed below it has been reached or exceeded.
A. predicts
B. claims
C. indicates
D. forecasts
词汇与结构The red warning light remains illuminated until the engine parameter is reduced _____ the limit.
A. under
B. above
C. over
D. below