睾丸在胚胎哪个时期开始下降到阴囊A.3个月B.4个月C.4~5个月D.7~8个月E.出生前后

作者: rantiku 人气: - 评论: 0
问题 睾丸在胚胎哪个时期开始下降到阴囊
选项 A.3个月 B.4个月 C.4~5个月 D.7~8个月 E.出生前后
答案 D
解析 :睾丸在胚胎7~8个月开始下降到阴囊。
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