单项选择题

A.HbA为零或存在,HbA220%~95%
B.HbA为零或存在,HbF20%~80%,HbA2量可减低、正常或增高
C.HbA2>3.2%,HbF1%~6%,其余为HbA
D.HbA97%,HbA2<3.2%,HbF<1%
E.HbF20%~95%