成人凝血时间的正常值为() ["A.1~3分钟","B.1~4分钟","C.1~5分钟","D.2~5分钟","E.3~5分钟"]
下列哪些指标更能准确反映血容量() ["A.尿量","B.心率","C.中心静脉压","D.心电图","E.血压"]
全麻下腹腔镜胆囊切除手术后,其取合适的体位是() ["A.半卧位","B.床头抬高15~30cm","C.去枕平卧头侧位","D.侧卧位","E.床尾垫高20cm"]
Miles手术适应于距肛门() ["A.5cm","B.6cm","C.7cm","D.8cm","E.12cm"]
继发性牙本质是前期牙本质是修复性牙本质是小球间牙本质是 ["在成牙本质细胞和矿化牙本质之间是一层未钙化的牙本质","牙本质钙质小球之间遗留的未钙化间质","在冠部靠近釉质和根部靠近牙骨质最先形成的牙本质","牙齿发育完成后形成的牙本质","釉质表而因磨损、酸蚀、龋病等而遭受破坏时,部分成牙本质细胞继续形成的牙本质"]
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