井盖为什么是圆的不是方的?
接受采访的人给出的答案中,最佳答案是这样解释的：一个方井盖会掉到洞里去,可能会伤人,也可能就被下水道的水冲走了.这是因为方井盖的对角线是它侧边的根号2 (1.414...)倍.所以你应该把一个方井盖几乎完全垂直地放置,一旦挪动一点,它就会掉下去.同放井盖相比,圆井盖从任何方向和角度看它的直径都几乎是一样的.不管它怎么放置,下方的小坑都可以阻止它掉下去.
希望对你有帮助!~
英语翻译Why are manhole covers round rather than square?The answ
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