单项选择题
A.IgG B.IgM C.IgD D.IgA E.IgE
A.L929 B.Wish C.K562 D.Yac-1 E.SP2/0
A.10% B.20% C.30% D.5% E.1%
A.RF B.CRP C.ANA D.抗-CCP(环瓜氨酸肽) E.补体活性
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