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【单选题】
患者，男，1岁2个月，仍未见第一颗乳牙萌出，已排除“无牙畸形”。 该发育异常不可能的病因是A.
佝偻病
B.
甲状腺功能低下
C.
营养缺乏
D.
全身性骨硬化症
E.
肯定与全身因素有关
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A.
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C.
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D.
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