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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)
2001-3-1 -04:00
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Back To Topic: 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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