下颌第二双尖牙牙冠形态轮廓为A.椭圆形B.长方形C.斜方形D.方圆形或椭圆形E.梯形

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问题下颌第二双尖牙牙冠形态轮廓为 A.椭圆形 B.长方形 C.斜方形 D.方圆形或椭圆形 E.梯形

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答案 D

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