?8403.Which characteristics apply to aircraft hydraulic systems?1.Minimum maintenance requirements.2.Lightweight.3.About 80 percent operating efficiency (20 percent ioss due to fluid friction).4.Simple to inspect.
发布于 2021-02-18 22:09:25
【单选题】
A 1,2, 3, 4.
B 1,3,4.
C 1,2, 4.
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