第26题: [单项选择]急性血源性骨髓炎大块死骨形成的原因主要是() A. 骨膜血管断裂 B. 骨的滋养血管栓塞 C. 脓肿直接破坏骨组织 D. 病理骨折 E. 身体抵抗力差 参考答案:B 答案解析:皮质骨的营养贴近骨膜的部分由骨膜下小血管网供给。靠近骨髓腔的部分由滋养血管供给。当脓肿将骨膜掀起时,就使骨膜与皮质骨分离,骨皮质表层即因失去血液供应而坏死。脓液进入骨髓腔和骨小管系统后,滋养血管及其分
第34题:[单选题]Since our stay was too short, we couldn’t visit all the places ______ . ( ) A. where we should like to visit B. which we should like to visit them C. where we should have liked to D. which we should have liked to 参考答案:D