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單項(xiàng)選擇題

【A1型題】釉質(zhì)外觀呈淡黃色的原因是（）

A.釉質(zhì)形成不全
B.釉質(zhì)礦化不全
C.釉質(zhì)礦化程度高，透出深部牙本質(zhì)的顏色
D.色素沉著
E.氟牙癥

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