年轻恒牙的牙根未完全发育，要在萌出后_年才达到应有长度，而_年后根尖孔才缩窄。填空题

作者: rantiku 人气: - 评论: 0

问题年轻恒牙的牙根未完全发育，要在萌出后_________年才达到应有长度，而_________年后根尖孔才缩窄。

选项填空题

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解析 2～3　3～5

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