题目内容

A毛氏Ⅱ类2分类错牙合
B毛氏Ⅲ类2分类错牙合
C毛氏Ⅱ类5分类错牙合
D毛氏Ⅱ类4分类错牙合
E毛氏Ⅳ类2分类错牙合
双颌或双牙弓前突E.

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When he was 28, the worst difficulty of all came to him. He began to notice a strange humming(嗡嗡声) in his ears. At first he paid little attention; but it grew worse, and at last he consulted doctors. (46) They gave him the worst news any musician could bear: he was gradually going deaf. Beethoven was in despair; he was sure that he was going to die.
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