轨道线路曲线半径R≤150时，轨距加宽标准为10mm。 ____答案

【单选题】

轨道线路曲线半径R≤150时，轨距加宽标准为10mm。 ___

A. R≤125

B. R≤150

C. R≤175

D. R≤200

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