20.人体第一和第二道防线的特点是生来就有的不是只针对某一特定的病原体而是对多种病原体都有防御作用因此叫做非特异性免疫.人体第三道防线的 Template




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tomski20.人体第一和第二道防线的特点是生来就有的不是只针对某一特定的病原体而是对多种病原体都有防御作用因此叫做非特异性免疫.人体第三道防线的 coloring