普速铁路，成段更换钢轨，无缝线路应力放散，成段调整轨缝，拆开接头并插入短轨头施工作业，开通后第一列限速（）km/h,第二列60km/h，第三列120km/h，其后恢复常速。

发布于 2021-02-18 22:10:51

【单选题】
A 20
B 45
C 60
D 80

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