混凝土是由什么制成的？
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Description
你可以不知道混凝土的历史，但一定知道过甚至亲眼瞻仰过最早的混凝土建筑——著名的罗马竞技场和万神庙的大圆顶。即便在两千年后，我们仍为这些古代建筑超强的坚固性惊叹不已。你知道吗，混凝土的配方看似简单，实则不然！来听小时候迷恋橄榄车的巴小播Bob怎么说。
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Published 12/06/18
Published 11/21/18
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