单项选择题
A.>20sB.>50sC.>150sD.>420sE.>290s
A.>10%B.>1.2%C.>5%D.>7%E.>21%
A.急性输血反应B.感染C.恶性肿瘤D.创伤E.SLE
A.急性失血B.缺铁性贫血C.再障D.巨幼细胞性贫血E.肠道吸收不良综合症
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