传染病在火群中传播及流行,必须具备的基本环节(  ) A.传染源 B.传播途径 C.易感人群 D.宿主 E.A +B +C

作者: tihaiku 人气: - 评论: 0
问题 传染病在火群中传播及流行,必须具备的基本环节(  ) A.传染源 B.传播途径 C.易感人群 D.宿主 E.
选项 A +B +C
答案 E
解析

相关内容:传染病,火群,传播,流行,环节,传染源,传播途径,易感,人群,宿主

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