• Described are the development process, main usage, technical parameters, main structure and testing of the D28 depressed center flat car.

    介绍D 28型凹底平车研制过程主要用途技术参数、主要结构试验情况等

    youdao

  • Described are the development process, main usage, technical parameters, main structure and testing of the D28 depressed center flat car.

    介绍D 28型凹底平车研制过程主要用途技术参数、主要结构试验情况等

    youdao

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