牛恶性卡他热是通过以下方式传播的()。A.病牛-易感牛B.病牛-绵羊-易感牛 C.病牛-吸血昆虫-易感牛

作者: rantiku 人气: - 评论: 0
问题 牛恶性卡他热是通过以下方式传播的()。
选项 A.病牛-易感牛 B.病牛-绵羊-易感牛 C.病牛-吸血昆虫-易感牛
答案 BD
解析

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