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【单选题】
骨髓增生综合征的难治性贫血伴原始细胞增多转变型（RAEB-T）血象特点是（）A.
外周血中原始细胞<1%，骨髓中原始细胞4%< /div>
B.
出现环形铁粒幼细胞，占骨髓有核红细胞的15%以上
C.
外周血中原始细胞为7%，骨髓中原始细胞为25%
D.
外周血中原始细胞为4%，单核细胞的绝对数超过1×10 9 ／L
E.
外周血中原始细胞为4%，骨髓中原始细胞为15%
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