单项选择题
A.1/2重链B.3/4重链C.2/4重链D.1/2轻链E.1/4轻链
A.1/2重链B.3/4重链C.2/4重链D.1/4轻链E.1/2轻链
A.IgAB.IgMC.IgD
A.IgAB.IgDC.IgGD.IgE
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