【名词&注释】
脐带血(umbilical cord blood)
[单选题]母儿血型不合重度溶血者指
A. 脐带血Hb<60g/L B. 脐带血Hb<70g/L C. 脐带血Hb<80g/L D. 脐带血Hb<90g/L E. 脐带血Hb<100g/L