患马副伤寒的妊娠病马常常是妊娠的第(?)发生流产。A.20一30天B.4一8个月C.2一3个月D.5个月E.8个月以上

作者: rantiku 人气: - 评论: 0
问题 患马副伤寒的妊娠病马常常是妊娠的第(?)发生流产。
选项 A.20一30天 B.4一8个月 C.2一3个月 D.5个月 E.8个月以上
答案 B
解析

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