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【单选题】
污秽等级Ⅲ线路盐密度范围是 kg/cm3。
A.
＞0.03～0.06
B.
＞0.06～0.10
C.
＞0.10～0.25
D.
＞0.25～0.35
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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