题目:
关于安氏Ⅱ类错,下列说法不正确的是()
A.安氏Ⅱ类错是一个单纯的错类型
B.安氏Ⅱ类错中大多数上颌骨位正常
C.在上颌骨位置异常者中,上颌后明显多于上颌前突
D.上牙弓后缩多于上牙弓前突
E.安氏Ⅱ类错中约60%患者下颌后缩
答案:
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