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【单选题】
既能保护本线路全长,又能保护相邻线路全长的保护是( )。
A.
距离Ⅰ段;
B.
距离Ⅱ段;
C.
距离Ⅲ段;
D.
高频距离保护。
参考答案：
参考解析：
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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