关于过敏原和抗原的叙述中正确的是 A.过敏原第二次进入机体才能引起过敏反应抗原第一次进入机体就能引起免疫反应b.过敏原第一次进入机体就 Template




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tomski关于过敏原和抗原的叙述中正确的是 a.过敏原第二次进入机体才能引起过敏反应抗原第一次进入机体就能引起免疫反应b.过敏原第一次进入机体就 coloring