?8399.What type of selector valve is one of the most com- monly used in hydraulic systems to provide for simultane- ous flow of fluid into and out of a connected actuating unit?
发布于 2021-02-18 22:09:21
【单选题】 A ?Four-port, ciosed-center valve. B ?Three-port, four-way valve. C ?Iwo-port, open-center valve.
