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井盖是圆的原因:只有园的才能保证无论从哪个角度放置井盖都不存在井盖掉到井里面的危险.想一下正方形或矩形的,掉下去可是很危险的,安全生产第一!

jdge (鱼)
(#373540@0)
2002-2-19 -04:00
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