诊断溶血性贫血最可靠的指标是()
A.网织红细胞明显升高
B.尿胆原排泄增加
C.尿含铁血黄素阳性
D.血清铁结合珠蛋白下降
E.红细胞寿命缩短
参考答案:E
已知y1=x+3,y2=2-x,当x取何值时,y1比2y2大5.
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