推导了缓和曲线的平行边线弧长计算公式，证明了平行边线的两个性质，对实际线路测设工作有指导意义。
The paper deduces the calculation formula of parallel sidelines of spiral curve, and proves two characters of parallels sidelines. It can be applied to instruct actual setting-out work.
推导了缓和曲线的平行边线弧长计算公式，证明了平行边线的两个性质，对实际线路测设工作有指导意义。
The paper deduces the calculation formula of parallel sidelines of spiral curve, and proves two characters of parallels sidelines. It can be applied to instruct actual setting-out work.
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