二尖瓣狭窄最常见的症状是() ["咯血","头昏","水肿","呼吸困难","体循环淤血"]
糖尿病酮症酸中毒的临床表现() ["原有症状加重或首次出现"三多"伴乏力","食欲减退,恶心,呕吐,极度口渴,尿量增多","有代谢性酸中毒症状","严重脱水伴循环衰竭体征","以上都是"]
玻璃体后脱离是玻璃体后皮质从何处分离() ["A.色素上皮层的内表面","B.脉络膜的内表面","C.视网膜的内表面","D.晶状体后囊膜的内表面"]
边缘性颌骨骨髓炎感染来源多为() ["牙源性","腺源性","损伤性","血源性","医源性"]
关于皮下气肿,不正确的是() ["系胸部皮下组织积存气体","用手按压时有摩擦感","偶见局部产气杆菌感染","多见于胸肺、气管或胸膜受损后","严重时向头颈及腹部蔓延"]
痉挛的原因主要是整个____所致,包括____、____、____。