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举一反三
【单选题】以下架空线路的防护措施，不正确的是（）
A.
有碍车辆和行人通行的拉线、撑杆等应加装警示标志
B.
与电力线及附属设施交越处不加装防护装置
C.
鸟啄、鼠咬、托磨等严重的段落应采取相应防护措施
D.
遇有过路高度不符合标准时，应及时处理
【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