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【多选题】
以下属于地下线路特点的有（ ）
A.
与地面交通完全分离，且不占城市地面和地上空间，基本上不受气候影响
B.
需要较大投资、较高的施工技术、较先进的管理、完善的环控、防灾措施
C.
造价低，施工方便，运营成本低，线路调整与维护较易
D.
与地面交通无干扰，造价介于另两种线之间，施工、维护、管理、环控、防灾等方面都较方便。
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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
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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
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