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人体最硬的部分是哪里
更新时间: 2020-09-15 00:00:00  

牙釉质,也称为珐琅质,是牙齿最外层的组织,牙冠的最外一层,是人体内最坚硬的组织,成熟的牙釉质为白色半透明的钙化程度最高的坚硬组织,主要成分:含钙和磷的磷灰石晶体,水及有机物。牙釉质内部并不具神经与血管,它的功用除了咬碎食物之外,也可以保护下层的牙本质。

关键词: 人体 部分 哪里

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