鸭嘴兽
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流落民间的13个冷知识，取之于民用之于民，取之不竭用之不尽
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1.迄今为止，人类科技所造就的最快速度，是由一个井盖完成的。那是在20世纪50年代美国的一次地下核试验中，爆炸的巨大冲击波将一个近一吨重的井盖炸飞，并且达到了地球逃逸速度（11.2…
