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【单选题】
关于 IgM 的分子特性 , 下列哪正确的 ?A.
CH 有 4 个功能区
B.
激活补体能力比IgG强
C.
是天然的血型抗体
D.
是未成熟 B 淋巴细胞的抗原识别受体
E.
是初次免疫应答的主要抗体
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