成角移位
参考答案：
成角移位是指两骨折段的轴线交叉成角，以角顶的方向称为向前、向后、向外或向内成角。
He has no idea what the book is about. He _____ have read it very carefully. [ ]
A. needn't
B. shouldn't
C. can't
D. mustn't
凉开方剂长于清热解毒的是
A．紫雪丹B．至宝丹C．安宫牛黄丸D．牛黄清心丸
