题目某无缝线路缓冲区采用25m标准轨,长轨的伸缩区计算长度为55m,则应取值为()A. 50mB. 62.5mC. 75mD. 100m某无缝线路缓冲区采用25m标准轨,长轨的伸缩区计算长度为55m,则应取值为()A. 50mB. 62.5mC. 75mD. 100m题目解答答案C. 75m