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【单选题】
根分叉病变的主要致病因素A.
牙根的解剖形态
B.
创伤
C.
菌斑
D.
牙颈部釉质突起
E.
磨牙牙髓感染经髓室底的副根管扩散到根分叉区
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A.
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B.
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C.
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D.
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【单选题】What does the author say about energy independence for America?
A.
It sounds very attractive.
B.
It ensures national security.
C.
It will bring oil prices down.
D.
It has long been everyone's dream.
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