900 句单选 -15 字以上 -551[音频][音频]
A. abnomal RPM
B. thrust loss
C. fuel leak
D. oil leak
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900 句单选 -15 字以上 -571[音频][音频]
A. restart hydraulic system
B. land at the nearest airport
C. return for landing due hydraulic failure
D. repair ram air turbine
900 句单选 -15 字以上 -744[音频][音频]
A. upcoming sandstorm
B. upcoming thunderstorm
C. Deteriorating visibility
D. Low-level windshear
900 句单选 -15 字以上 -760[音频][音频]
A. To avoid collision
B. To give way to another aircraft
C. To do the troubleshooting
D. To wait for maintenance crew
900 句单选 -15 字以上 -761[音频][音频]
A. aerobridge
B. stairs vehicle
C. ground marshaller
D. terminal building