helical curve短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 螺旋曲线 Making use of the points measured on the drum helical curve of concrete- mixer truck, the helical angle formula of the helical curve is obtained by means of least square method. 利用测得的混凝土搅拌车拌桶螺旋线上的一组离散点，通过最小二乘法拟合出了求解拌桶螺旋线螺旋角的公式。 dictall