“大马路上的下水井盖为什么是圆的?”这是出自微软公司的一道经典面试题。应试者的回答多种多样。“井盖是什么形状,完全取决于它要覆盖的井口形状。如果井口是圆的,井盖也就得是圆的。”“圆是最简单的美,有很好的观赏性,所以人们就把井盖设计成圆的。”“在周长相等的几何图形中,圆的面积最大。设计成圆的,有利于通过更多的下水。”“圆的受力均匀,最能承受来自不同方向的压力,因而不易损坏。” “Why is the trunk on the street a round? ” This is a classic interview from Microsoft. Candidates’ responses varied. “The shape of the manhole cover depends entirely on the shape of the wellhead it covers. If the wellhead is round, the manhole cover also has to be round. ” “The circle is the simplest one, with good ornamental properties, so People put the covers in a circle. ”“ The circle has the largest area in an equal-length geometric figure, designed to be round, to allow more water to pass through. ”“ The most able to withstand the pressure from different directions, and therefore not easily damaged. ”