小细胞低色素性贫血时,血液学指标发生下列变化:
A.MCV ↓, MCH↓, MCHC↓
B.MCV ↓, MCH↑, MCHC↑
C.MCV ↑, MCH↓, MCHC↓
D.MCV ↑, MCH↑, MCHC↑
E.MCV ↓, MCH 正常, MCHC 正常

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