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【单选题】
牙齿的牙合面可以描述为A.
牙冠有咀嚼功能的一面
B.
牙冠发生接触的一面
C.
上下颌牙齿在咬合时接触的部位
D.
上下颌的后牙在咬合时发生接触的面
E.
牙冠上有牙尖突起的部位
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【单选题】According to the author, which of the following is true about British authors of children's literature in the mid-18th century?
A.
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B.
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C.
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D.
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A.
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B.
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C.
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