传染病流行过程的三个环节是指:A、传染源、传播途径、传播机制B、生物环境、物理环境、社会环境C、传染源、宿主、环境D、传染源、传播途径、易感人...

作者: rantiku 人气: - 评论: 0
问题 传染病流行过程的三个环节是指:
选项 A、传染源、传播途径、传播机制 B、生物环境、物理环境、社会环境 C、传染源、宿主、环境 D、传染源、传播途径、易感人群 E、病因、宿主、环境
答案 D
解析

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