[单选题]Because all the roads leading to the mountain village , the rescue workers were not able to reach it to help. A.were blocked B.are blocked C.have been blocked D.had been blocked
第24题: [单项选择]50岁以上髋关节骨关节炎病人有明显疼痛和运动障碍者,应首选 A. 髋关节融合术 B. 截骨术 C. 人工关节置换术 D. 关节清理术 E. 钻孔减压术 参考答案:C 答案解析:[解题思路] 目前对50岁以上的髋关节骨关节炎病人,有明显疼痛和运动障碍者,特别是因损伤、畸形或其他原因而引起的继发性骨关节炎病人,倾向于作全髋关节置换术。其特点是切除有病变的髋臼和股骨头,可早期起床