乳牙出齐的年龄，正常情况下最晚不超过A. 1岁半 B.2岁 C.2岁半 D.3岁 E. 3岁半

作者: tihaiku 人气: - 评论: 0

问题乳牙出齐的年龄，正常情况下最晚不超过

选项 A. 1岁半 B.2岁 C.2岁半 D.3岁 E. 3岁半

答案 C

解析乳牙多于生后4?10个月开始萌出，2?2.5岁出齐20颗乳牙，2岁内乳牙的数目约等于其月龄减去4?6。

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