railway track in use 中文意思是什麼
railway track in use
解釋
通車里程-
The ministry of railway has developed two kinds of frequency - shift track circuits based on the primary 4 - information frequency - shift system : 18 - information frequency - shift auto - blocking track circuit made in china and um - 71 jointless track circuit made in france, and put them into use on some important lines. but at the mean while, the safety of running train becomes austerer and austerer
鐵道部根據我國國情,在原有4信息移頻制式的基礎上,研製開發了兩種移頻軌道電路:國產18信息移頻自動閉塞系統和法國um - 71無絕緣軌道電路系統,並將其應用到我國部分主要線路上。
分享友人