维生素D缺乏性佝偻病的初期，血生化可表现为
A．血钙正常
B．血钙稍低
C．血肌酐上升
D．钙磷乘积小于30
E．血碱性磷酸酶增高
参考答案：A,B,D,E
His favorite subject _____ science. [ ]
A. is
B. are
C. does
D. am
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