上颌中切牙的唇面通常位于切牙乳突中点前 ( )A.8~10mm B.16~20mm C.5~7mm D.1~4mm E.11~15mm

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问题 上颌中切牙的唇面通常位于切牙乳突中点前  (    )

选项 A.8~10mm
B.16~20mm
C.5~7mm
D.1~4mm
E.11~15mm

答案A

解析
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