用多义线摹拟通过ＨＹ点的缓和曲线。 输入起始切线、终止法线、缓和曲线终止点。 命令：ＥＬＩＮ１- With a polyline through the HY-point mimic the relaxation curve. Enter the start tangent, normal termination, the termination point of transition curve. Command: ELIN1