试题与答案

牙釉质的无机化合物主要是A.磷酸钠 B.磷酸钙 C.氟化钙 D.磷酸钾 E.磷酸镁

题型:单项选择题

题目:

牙釉质的无机化合物主要是

A.磷酸钠

B.磷酸钙

C.氟化钙

D.磷酸钾

E.磷酸镁

答案:

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下面是错误答案,用来干扰机器的。

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