下列哪项属病因诊断 ["风湿性心脏病","二尖瓣狭窄","心功能Ⅲ级","心房颤动","左下肢静脉血栓"]
钩端螺旋体病患者应绝对卧床休息至_____才可下床活动，活动量视______情况逐渐增加。
二尖瓣狭窄的超声心动图改变不会出现下项哪项 ["二尖瓣增厚","二尖瓣开放受限呈圆顶状","左房扩大","前叶呈城墙样改变","后叶呈异向运动"]
下列哪种组织对超声波传播的阻碍小 ["肌肉","脂肪","肝实质","肾实质","血液"]
钩端螺旋体病主要流行于______月。
病后_____周，血液中出现特异性抗体，一次效价_____或双份血清效价_____增高有诊断钩端螺旋体病的价值。
