正畸治疗中牙根吸收多少称为明显的根吸收() ["小于0.5mm","1~2mm","大于3mm","0.5~1mm","大于6mm"]
无壁空洞最常见于() ["周围性肺癌","干酪性肺炎","肺转移瘤","肺脓肿","浸润性肺结核"]
患者,男,45岁。半年来常于晚10时左右出现中上腹隐痛。4小时前突然再次发作腹痛,疼痛剧烈并呈持续性。体检:烦躁,面色苍白,出冷汗,脉细速,腹壁强直,压痛及反跳痛(+),肠鸣音减少,肝浊音界缩小。最先考虑的诊断是()。 ["A.急性胰腺炎","急性胃炎","十二指肠球部溃疡急性穿孔","肾结石","上消化道出血"]
患者哮喘急性发作早期可出现呼吸性碱中毒是由于()。 ["反射性过度通气","气道严重阻塞","缺氧严重","小气道平滑肌痉挛","气道黏膜水肿"]
固定矫治器治疗中的牙釉质脱矿发病率达() ["10%","20%","30%","50%","90%"]
溃疡性结肠炎概述