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简述联合收割机液压系统的结构及工作原理,多级调压回路的组成和工作原理,以及在联合收割机液压系统中的作用。
The structure and working principle of the hydraulic system of the combine harvester, the composition and working principle of the multi-stage pressure regulating circuit, and the role in the hydraulic system of the combine harvester are briefly described.