问题

(单选题)小儿极重度贫血的诊断指标是()
A:Hb>120g/L
B:Hb120~90g/L
C: Hb90~60g/L
D: Hb60~30g/L E. Hb<30g/L
B:Hb120~90g/L
C: Hb90~60g/L
D: Hb60~30g/L E. Hb<30g/L
正确答案是: