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【多选题】
铺设无缝线路前期工程主要工作内容
A.
校正、改善线路纵断面和平面
B.
抽换轻伤有发展的钢轨及配件
C.
均匀轨缝 , 螺栓涂油 , 整修、补充防爬设备 , 锁定线路
D.
更换失效轨枕、严重伤损混凝土枕及扣件
E.
清筛道床 , 补充道碴 , 改善道床断面
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题目标签：线路
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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