题目内容
釉质和牙骨质在牙颈部相连的关系是
2022-02-17
A.约70%釉质和牙骨质端端相连
B.约30%牙骨质少许覆盖在釉质上
C.约10%釉质和牙骨质并不相连
D.全部为釉质和牙骨质端端相连
E.约30%釉质少许覆盖在牙骨质上
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