题目内容
4岁以前乳牙期牙尖交错的特征有
2021-11-16
A.上下第二乳磨牙的远中面平齐
B.上领两侧中切牙之间萌出初期有间隙
C.常有牙列拥挤现象
D.覆较浅或成对刃
E.纵曲线和横曲线均较明显
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