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[单选] 起落架是由哪个液压系统作动的?Which hydraulic systems drive the landing gear?
A.系统1作动机翼起落架,系统4作动机身和前起落架 System 1 drives the wing gear, system 4 drives body gear and nose gear B.系统1 作动机身和前起落架,系统4作动机翼起落架 System 1 drives body gear and nose gear, system 4 drives the wing gear C.系统1作动机身起落架,系统4作动机翼起落架和前起落架 System 1 drives body gear; system 4 drives the wing gear and nose gear
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