单选题:下列有关维生素D的叙述,哪项是错误的(  )

题目内容:
下列有关维生素D的叙述,哪项是错误的(  ) A.维生素D的活性形式是1,25-(OH)2-D3
B.维生素D的两次羟化作用都是在肝中进行
C.促进小肠中钙结合蛋白的合成
D.提高血浆钙、磷含量
E.缺乏时可发生佝偻病
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答案解析:

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在水利水电工程注册建造师执业工程规模标准中,农村饮水工程的执业工程规模标准根据其(  )确定。A.等别 B.级别 C.投资额 D.供水人口数量

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