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【多选题】
铁路下采煤主要指线路下采煤，也包括（）。
A.
桥涵下采煤
B.
隧道下采煤
C.
建筑物下采煤
D.
车站下采煤
E.
田地下采煤
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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