单项选择题

新生儿低钙血症是指血清总钙低于

A.2.75mmol/L
B.3.75mmol/L
C.4.75mmol/L
D.6.75mmol/L
E.1.75mmol/L
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单项选择题
早期低钙血症，发生的时间为生后
A.36小时内
B.48小时内
C.72小时内
D.12小时内
E.24小时内
未分类题
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B.
What
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