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【多选题】
（）两相邻线路中心线间的标准距离是5米。
A.
客货共线站内正线
B.
客货共线到发线与相邻到发线
C.
客货共线站内相邻两线只有一条通行超限货物列车
D.
铺设列检小车轨道的两到发线
参考答案：
参考解析：
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【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers