题目内容

词汇与结构Backup system control modes operate _______in the event of system failures.

A. mechanically
B. automatically
C. hydraulically
D. manually

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词汇与结构The pressure maintained within the cabin is referred to as the _______ effective cabin altitude.

A. equivalent
B. parallel
C. similar
D. relevant

词汇与结构Pressurization problems can seriously ______ the consciousness of the pilot.

A. disturb
B. impair
C. infer
D. affect

词汇与结构If a controller fails, pack control switches ______ to the other controller.

A. electronically
B. manually
C. electrically
D. automatically

词汇与结构Pack output is increased automatically during high pack demand periods to compensate for a failed pack or recirculation fan, or is limited during high bleed air demand periods such as for gear ______.

A. reiteration
B. retraction
C. restriction
D. reduction