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记得电视上一次智力竞赛，老师让学生测一块石灰的比重，学生就把它放进装着水的量杯中了。你猜比重是多少？
rolling
(Rollor)
(#29466@0)
Last Updated: 2001-3-1
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原来空气没重量！我一条12斤的被子，抽成真空还是12斤！
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