【单选题】
道岔应设在直线地段，道岔端部至曲线端部的距离不宜小于___，车场线可以减少到3m。
A. 2m
B. 3m
C. 4m
D. 5m
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答案
D
解析
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对于连接市中心与周边卫星城的线路及开行大站快车线路，平均站间距离大，其最高运行速度应大于___。
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筒放散法是先封锁线路，然后将钢轨扣件全部松开，拆除长轨条端部的接头夹板，在长轨条底部每隔___放置一滚筒。
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