为酸蚀后的最表层,厚约10mm()
A.树脂-牙釉质界面
B.树脂突
C.酸蚀层
D.定性微孔层
E.定量微孔层
参考答案:C
-I can’t find my ID card.
-There is ___ ID card in the lost and found case. [ ]
A the
B an
C a
D 不填