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【单选题】
道床作用有()。
A.
支承轨枕，把从轨枕上传来的压力均匀地传给路基；
B.
固定轨枕的位置，阻止轨枕纵向和横向移动；缓和机车车轮对钢轨的冲击；
C.
调整轨道框架的水平方向，保持线路良好的平面和纵断面；具有排水作用。
D.
以上都是
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