短語詞組短語parabolic vertical curve 拋物線型豎曲線parabolic transition curve 拋物線形緩和曲線parabolic c curve 拋物曲線cutting parabolic curve equation 切割拋物線方程parabolic type of curve 拋物型曲線parabolic curve fitting 拋物線擬合regression parabolic curve 回歸拋物線arc parabolic curve 拋物線形曲線parabolic curve fitting method 拋物線擬合法 返回 parabolic curve