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【单选题】
铁路线间距为区间及站内两相邻线路中心线间的标准距离，线间最小距离的基本规定为：线路允许速度140km／h以上至160km／h的区段，站内正线与相邻到发线间为( )mm。A.
4200
B.
4400
C.
4500
D.
5000
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