书上说碳在自然界中的存在形式为二氧化碳和碳酸盐,但是为什么没有单质碳? 知乎 Template




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tomski书上说碳在自然界中的存在形式为二氧化碳和碳酸盐,但是为什么没有单质碳? 知乎 coloring