ballast bed造句

例句与造句

1. To design thickness of ballast bed is based on the required strength of track structure and partly the experience in national railway
   现行的地铁设计规?对道床厚度的选择仅根据轨道强度要求和国铁的经验确定。
2. The essential cause that induces subway vibration is the inter action between the train ’ s wheels and rail . through the sleeper , ballast bed , roadbed and soil layer , the vibration spread to far place
   地铁振动产生的根本原因是由于轮轨的相互作用,再通过轨枕、道床、路基和土层依次向远处传播。
3. The low cost track , which consists of the traditional wide - sleeper tack , ballast bed with rubber bits and the elastic packing material between sleepers , is a new type with three - dimensional elasitic support
   摘要介绍以传统的宽枕轨道框架、碎橡胶道床、枕端无遮挡弹性定位和枕间弹性材料密封装配成的，具有三维弹性支撑的碎橡胶道床轨道。
4. It's difficult to find ballast bed in a sentence. 用ballast bed造句挺难的