下列有关人体免疫的叙述正确的是 �血浆中溶菌酶的杀菌作用属于人体的第一道防线 �抗原都是外来异物 �人体分泌的乳汁中含有某些抗体 � Template




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tomski下列有关人体免疫的叙述正确的是 �血浆中溶菌酶的杀菌作用属于人体的第一道防线 �抗原都是外来异物 coloring