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【单选题】
铁路技术管理规程》中规定:水平的允许误差,在维修线路的正线,到发线上,不得大于4mm,其他线不得大于___为基准。
A. 6mm
B. 5mm
C. 4mm
D. 3mm
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城市轨道交通的现有运营线,最大外轨超高为___。
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联络线、出入线的最大坡度不宜大于___(均不考虑各种坡度折减值)
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