單項(xiàng)選擇題患兒女,10個(gè)月,因“面色蒼白,精神、食欲差2個(gè)月”來診。人工(羊奶)喂養(yǎng),未添加輔食。查體:面色蒼白,瞼結(jié)膜蒼白;心前區(qū)可聞及Ⅱ/Ⅵ級(jí)柔和收縮期雜音,肝肋下2cm,脾肋下1cm。血常規(guī):Hb75g/L,RBC2.2×1012/L,WBC6.0×109/L,PLT110×109/L,網(wǎng)織紅細(xì)胞0.01。下列檢查結(jié)果中最有助于患兒臨床診斷的是()

A.外周血出現(xiàn)有核紅細(xì)胞
B.骨髓中各期幼紅細(xì)胞比例減少
C.骨髓中原始紅細(xì)胞比例增高
D.骨髓中幼紅細(xì)胞呈巨幼變
E.血清LDH增高


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2.單項(xiàng)選擇題患兒男,10個(gè)月,單純母乳喂養(yǎng),1個(gè)月前反復(fù)腹瀉。查體:皮膚、黏膜輕度蒼白;肝肋下1cm,脾肋下1cm。血常規(guī):Hb80g/L,RBC3.2×1012/L,WBC5.0×109/L,PLT121×109/L?;純和庵苎螒B(tài)學(xué)檢查結(jié)果應(yīng)該是()

A.MCV(fl)80~94,MCH(pg)28~32,MCHC(g/L)320~380
B.MCV(fl)80~98,MCH(pg)28~36,MCHC(g/L)320~400
C.MCV(fl)>94,MCH(pg)>32,MCHC(g/L)320~360
D.MCV(fl)<80,MCH(pg)<28,MCHC(g/L)320~360
E.MCV(fl)<80,MCH(pg)<28,MCHC(g/L)<320