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【多选题】
接零线路的安全要求主要有（）。
A.
在同一供电系统中，不允许保护接地与保护接零共存
B.
零线上不准装设过电流保护装置
C.
线路上不允许装设速断保护装置
D.
应装设足够的重复接地装置
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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