In this paper, the development process, manufacturing, formation, test, delivery and maintenance of the trains are mainly introduced.

本文主要介绍了列车的开发过程、制造、编组、试验、交车及维修。

youdao

In this paper, the development process, manufacturing, formation, test, delivery and maintenance of the trains are mainly introduced.

本文主要介绍了列车的开发过程、制造、编组、试验、交车及维修。

youdao