这些操纵面是液压作动的,并且在起飞和降落时展开或收回。

发布于 2021-02-26 02:34:40
【单选题】
A These control surfaces are hydraulically supplied and are only extended or retracted during take off and landing.
B These control surfaces are hydraulically moved and are only extended or retracted during takeoff and landing.
C These control surfaces are hydraulically powered and are only extended or retracted during takeoff and landing.

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