短語詞組短語easement t curve 緩和曲線spiral easement curve 螺旋緩和曲線;螺旋型緩和曲線easement curve design 緩和曲線設(shè)計(jì)Parallel to easement curve 緩平線Easement or Transition Curve 漸曲線length of easement curve 緩和曲線長part easement curve 不完整回旋線vertical easement curve 豎向緩和曲線easement -circular curve 緩圓曲線 返回 easement curve