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结合机务部门特点，不断深化“二三五”机务部门“二三五”子系统的建立与完善，是在分局母系统的指引带动下逐步完成的，大体经历了四个过程。
Combined with the characteristics of the maintenance department, deepening the establishment and improvement of the “235” sub-system of the “235” maintenance department was carried out gradually under the guidance of the branch parent system and generally went through four processes.