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男，55岁。3个多月来乏力、面色苍白，体重下降6kg。既往体。化验Hb60g/L，RBC3．0×l012／L，WBC8．2×l09／L．Plt 310×109／L，外血涂片见红细胞中心淡染区扩大。为寻找贫血的病因，首选的检查是A.
腹部B超
B.
血清铁蛋白
C.
尿常规
D.
大便隐血
E.
骨髓检查
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