• <span id="v49jp"><var id="v49jp"></var></span>

            1. <address id="v49jp"><cite id="v49jp"><ruby id="v49jp"></ruby></cite></address>

                News Category

                Your Position:Home>News>industry>Basic knowledge of rail

                Basic knowledge of rail

                Time:2022-09-16 Click:7001

                Introduction to the historical changes of railway rails, modern rail knowledge, rail classification, rail production and transportation and other basic knowledge.

                Rail is a common and inconspicuous thing in our life, and it can be seen everywhere in film and television. It is always in an inconspicuous place for the train to roll, guide, bury in the soil and penetrate the dust. But it's not only the foundation of the train, it's also a guy with a history. Today, let's talk about it, and take the reader to learn about the rail knowledge.


                在线观看免费av的网址,成 人 网站免费变态,黄片av不卡在线播放,九九热精品在线观看
              1. <span id="v49jp"><var id="v49jp"></var></span>

                        1. <address id="v49jp"><cite id="v49jp"><ruby id="v49jp"></ruby></cite></address>