我们知道,抛物线是一种对称曲线,因而桥梁专家总是将桥梁设计成抛物线形状,这样既美观大方、雄伟壮观,又坚固实用,正因为如此,引起了命题专家的浓厚兴趣,许多省市总是以各类拱桥为命题背景,设计成丰富多彩的利用二次函数性质求解问题的试题,现举例说明. We know that parabola is a symmetric curve, so bridge experts always design the bridge into a parabola shape. This is not only beautiful, magnificent, but also strong and practical. Because of this, it has attracted the interest of proposition experts, many provinces and cities Based on propositional background of various types of arch bridges, it is designed as a rich and colorful problem using quadratic function to solve problems.