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【单选题】
线路除雪标准下列叙述正确的是（）。
A.
积雪（冰）低于轨面高度，不得覆盖钢轨
B.
钢轨外侧100cm范围内积雪（冰）需清除
C.
钢轨与路面间凹槽内积雪（冰）不必须清除干净
D.
大库门前积雪（冰）不用清扫干净，不影响正常库门开关
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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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