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举一反三
【单选题】500kV、110kV架空电力线走廊宽度分别为( )m。
A.
60～75；15～30
B.
50～60；15～30
C.
60～75；15～25
D.
50～60；15～25
【单选题】电力线的方向（ ）。
A.
起始于正电荷，终止于负电荷，即不闭合，也不中断，也不相交
B.
起始于负电荷，终止于正电荷，即不闭合，也不中断，也不相交
C.
起始于正电荷，终止于正电荷，即不闭合，也不中断，也不相交
D.
起始于电荷，指向无穷远处
【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