玻璃和砂子里都含有二氧化硅,为什么前者是透明的,而后者却不透明?物质的透明与否是由什么因素来决定的? 豆丁� Template




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tomski玻璃和砂子里都含有二氧化硅,为什么前者是透明的,而后者却不透明?物质的透明与否是由什么因素来决定的? 豆丁� coloring