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当前学科：临床乡镇执业助理医师
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男性，1岁，因发育落后来诊。查体：皮肤细嫩。眼距宽、鼻梁扁平、舌常伸出口外，小拇指向内侧弯曲，通贯掌。为确诊需首选的检查是（）
A
骨龄
B
染色体
C
甲状腺功能
D
尿氨基酸
E
智商测定
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