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Popular philosophy 哲学史讲演录
Popular philosophy 哲学入门:苏菲的世界
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Popular philosophy 和尚与哲学家:佛教与西方思想的对话
Popular philosophy 当代阿拉伯哲学研究
Popular philosophy 初晨
Popular philosophy 伯林
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Popular philosophy 科学小魔术
Posted on 2010-08-25
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首先,在两根同样的试管中部蒙上橡皮膜,然后把两个试管都装入同样多的水后分别放到两只装有同体积水的量杯里。注意,一定要保持试管内的水面和量杯里的水面一样高。接着观察一下试管中部的橡皮膜,有无凹凸的情况发生。俗话说:“不蒙不盖变不出。”那就再取出两块同样大小的手帕,分别将两个量杯盖住。既然是魔术,为了迷惑观众,可故意对量杯念一番“咒语”。不过,切记,用手帕盖住量杯的瞬间,迅速将一小块食盐放入其中一个量杯中(不是放入试管中),又将另一小块食盐放入另一个量杯的试管内。为了让盐充分化成盐水,也可以对量杯吹气。过了一会掀开手帕时,大家会发现:一个试管中部的橡皮膜往外凸,另一个试管中部的橡皮膜往里凹,而量杯中的水面却保持原来的位置,并没有发生任何的变化。看到这里你是否觉得很神奇呢?只要弄清原因你就会知道是怎么回事了。
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