單項選擇題小細胞低色素性貧血時,血液學指標發(fā)生下列變化()
A.MCV↓,MCH↑,MCHC↓
B.MCV↑,MCH↑,MCHC↑
C.MCV↑,MCH↓,MCHC↓
D.MCV↓,MCH↓,MCHC↓
E.MCV↓,MCH正常,MCHC正常