单项选择题
A.IgG与抗原结合成的免疫复合物 B.IgM C.IgG2 D.聚合的IgA E.SIgA
A.C1q B.C3a C.C5a D.C4b E.C2a
A.C4a B.C3b C.C5b D.C2b E.C2a
A.C123456789 B.C124536789 C.C145236789 D.C142356789 E.C124356789
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