牛白血病与(?)有关。A．细菌B．病毒C．寄生虫D．食物E．遗传

作者: rantiku 人气: - 评论: 0

问题牛白血病与(?)有关。

选项 A．细菌 B．病毒 C．寄生虫 D．食物 E．遗传

答案 D

解析

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