单项选择题
A.C1q B.C1 C.C3b+C4b D.C5 E.C1γ
A.C1r B.C1s C.C1q D.Df E.C5aR
A.C3b B.C2a C.C5a D.C4b E.iC3b
A.IgG B.IgM C.IgG D.IgA聚合物 E.IgG
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