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离题万里
Re: 山东大学自主招生现神题:井盖为啥是圆的?厕所和黑板有啥关系?
by
Sunmerdy
on
13/06/2017, 06:29:17 UTC
圆的能保证在各个方向上井盖都会大于井口,不会掉下去;如果是方,调整角度,井口对角线大于井盖边长,井盖会掉下去。