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【多选题】
下列线路作业中，（）属于临时补修的主要内容。
A.
线路养护
B.
更换和修理轨枕
C.
调整严重不良轨峰
D.
整修严重不良的道口设备
E.
垫入或撤出冻害垫板
F.
拔草
参考答案：
参考解析：
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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