试题与答案

血浆中含量最恒定的元素是() A.钙 B.磷 C.钾 D.钠 E.钠和氯

题型:单项选择题 B型题

题目:

血浆中含量最恒定的元素是()

A.钙

B.磷

C.钾

D.钠

E.钠和氯

答案:

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