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【单选题】
下面所列楔状缺损的病因中应除去
A.
刷牙
B.
牙颈部的特殊结构
C.
釉质发育不全
D.
酸性龈沟液
E.
牙体应力疲劳
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A.
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B.
归热型
C.
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A.
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A.
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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