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【单选题】
顺线路走时，应走两线路中间，人体及所携带的工具（料）不得侵入（ ）限界，并注意邻线的机车、车辆运行和货物装载情况。
A.
安全
B.
机车车辆
C.
机车
D.
车辆
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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
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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
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