what's the ingradients in the egg shell?

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what's the ingradients in the egg shell?
what's the ingradients in the egg shell?

what's the ingradients in the egg shell?
鸡蛋壳的成分是什么?
答：碳酸钙.（不好意思,碳酸钙的英文不知道怎么说）

CaCO3

calcium carbonate
CaCO3

主要是Ca元素,含有CaCO3,但不表明他就是!

Caco3