如图,是一条河,C是河边AB外一点:现欲用水管从河边AB,将水引到C处,请在图上画出应该如何铺设水管能让路线最短.并说明理由.
解:如图所示,沿CE铺设水管能让路线最短, 因为垂线段最短.
Tom some pigs and ducks in his family.