【curve length】指的是曲线的起点至终点之间的弧线长度。 对于任意的多元函数，在任意的一点有切向量 a，则此条曲线的长度即为
导出了隧道控制测量中缓和曲线理论投点曲线长的直接求解公式。
The direct solution formula for the curve length of a theoretical control point on the transition curve is proposed, with the solution of high order equation being avoided.
通过对牵引链的挠度和链曲线长的计算，确定链传动需要调整的适当时期。
Through the calculation on flexivity of drag-chainand length of chain curve, set screw-pulling instrumentneeds to be adaptedto suitable period.
一种电子长度面积求算仪，涉及一种计算曲线长度和图形面积的求算装置。
An electronic length and area calculating instrument relates to a calculating device used for calculating the curve length and the area.
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