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抛物线的作图方法虽有多种,但在实际放样时,均有很大难度,要使用方程y~2=2 P x或y=4fx(L-x)/L~2绘出曲线,事先必须进行烦琐计算,才能求得
Although there are many ways to draw the parabola, it is very difficult to actually lay out the samples. To draw a curve using the equation y 2 = 2 P x or y 4fx (Lx) / L 2, Cumbersome calculation, to obtain