请问:自来水管为什么要制成圆形的?也许人人都能答得上来:第一,承受水压均匀,第二,加工管子的工艺简单,第三,……可是,你未必知道:当材料用量相等时,圆形水管输送的水量最大。在建筑工地上,我们还能遇到一些类似的问题,例如:在一定条件下, I would like to ask: Why should the water pipe be made round? Perhaps everyone can answer it: First, to withstand the pressure evenly, and secondly, the process to process the pipe is simple. Third,... But you may not know: When When the amount of material is equal, circular water pipes deliver the greatest amount of water. On the construction site, we can also encounter some similar problems, such as: under certain conditions,