词汇与结构The primary flight control system uses __________ control wheel, column and pedals linked mechanically to hydraulic power control units which command the primary flight control surfaces.
A. controversial
B. modern
C. conventional
D. modernized
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词汇与结构The flight controls are powered by _________ hydraulic sources: system A and system B.
A. another
B. abundant
C. other
D. redundant
词汇与结构The secondary flight controls, high lift devices _________ of trailing edge flaps and leading edge flaps and slats, are powered by hydraulic system B.
A. consist
B. are consisted
C. consisting
D. is consisted
词汇与结构_________ hydraulic system B fails, the trailing edge flaps can be operated electrically.
A. In the charge
B. In the event
C. In order that
D. In place of
词汇与结构_________ certain conditions the power transfer unit automatically powers the leading edge devices
A. On
B. At
C. Over
D. Under