1.下列有关传染病和免疫的说法正确的是 A.抗体是一种蛋白质它是由侵入人体的抗原产生的b.接种疫苗可以有效预防传染病是因为疫苗能直接 Template




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tomski1.下列有关传染病和免疫的说法正确的是 a.抗体是一种蛋白质它是由侵入人体的抗原产生的b.接种疫苗可以有效预防传染病是因为疫苗能直接 coloring