图为铁路职工更换钢轨。王宽宁磊摄图为铁路职工更换钢轨。王宽宁磊摄图为铁路职工对钢轨进行打磨。王宽宁磊摄图为施工现场。王宽宁磊摄图为施工现场。(无人机照片)王宽宁磊摄图为质检人员对作业质量进行检查。王宽宁磊摄图为施工现场。王宽宁磊摄
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