问题

(单选题)8岁小儿重度贫血的诊断指标是()
A:Hb大于120g/L
B:Hb90~120g/L
C: Hb60~90g/L
D: Hb30~60g/L E. Hb小于30g/L
B:Hb90~120g/L
C: Hb60~90g/L
D: Hb30~60g/L E. Hb小于30g/L
正确答案是: