A300

?8442.Most variable displacement aircraft hydraulic pumps in use

发布于 2021-02-18 22:10:05
【单选题】
A ?must be driven at a nearly constant speed in order to be practical for use.
B ?are not practical for use with a closed-center hydraulic system.
C ?contain a built-in means of system pressure regulation.

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美滋滋
美滋滋 2023-02-18
整天做梦的纠结症患者
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