我国铁路是世界上最庞大的国家,线路总长度也是世界是最长的,请问:我国铁路的标准轨距是多少?就是两股钢轨间的垂直距离是多少?

来源:学生作业帮助网 编辑:作业帮 时间:2024/10/04 06:42:08
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