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ＳＳ_４改进型机车电气线路的改进设计株洲电力机车厂周光海ＳＳ４型电力机车问世以来，经过了几次重大的技术改进。大致可以分为三个阶段：第一阶段是ＳＳ４０００１样车；第二阶段是ＳＳ４０００２、ＳＳ４０００３机车以及其后批量生产的早期ＳＳ４型机车；第三阶段是?..
SS_4 improved locomotive electric circuit design Zhuzhou electric locomotive factory Zhou Guanghai SS4 electric locomotive since its launch, after several major technological improvements. Can be roughly divided into three stages: the first stage is the SS40001-like car; the second stage is the SS40002, SS40003 locomotives and subsequent production of the early SS4 locomotive; the third stage is?