单项选择题
A.CD2 B.CD19 C.CD4 D.CD8 E.CD20
A.65%~70% B.70%~75% C.75%~80% D.80%~85% E.85%~90%
A.C123456789 B.C132456789 C.C143256789 D.C142356789 E.C124356789