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这些顺口溜,是济南机务段东风4型2023号机车司机张德元同志多年来学习与实践的经验总结。为达互相学习共同提高之目的,现刊登于下。
These jingle, is the Jinan locomotive section Dongfeng 4 2023 locomotive driver Comrade Zhang Deyuan years of learning and practice experience. To achieve the purpose of learning from each other to enhance together, now published in the next.