33.牙釉質發育不全(enamel hypoplasia)的出現是因為在那一時期發育異常?
(A)帽狀期(cap stage)
(B)沈積期(apposition)
(C)鈣化期(calcification)
(D)鐘形期(bell stage)
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統計: A(9), B(110), C(27), D(75), E(0) #1035524
統計: A(9), B(110), C(27), D(75), E(0) #1035524