下颌第一磨牙髓室顶最凹处约平齐于A.冠、中1/3交界处 B.颈缘上2mm C. 颈缘 D.颈缘下2mm E.根分叉处

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问题下颌第一磨牙髓室顶最凹处约平齐于

选项 A.冠、中1/3交界处 B.颈缘上2mm C. 颈缘 D.颈缘下2mm E.根分叉处

答案 C

解析

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