三尖瓣狭窄的X线检查可见右房缘距中线的最大距离为() [">4cm",">5cm",">3cm",">1cm",">2cm"]
有φ62mm油管内容积是30.18L/l0m,该油管的长度1000m,其内容积是多少?
三尖瓣狭窄临床表现由体循环淤血而致() ["腹胀","房颤","肺栓塞","疲乏","呼吸困难"]
三尖瓣狭窄的临床表现,由心排血量低引起() ["肺栓塞","房颤","腹胀","疲乏","呼吸困难"]
慢性主动脉瓣关闭不全的心电图表现() ["右心室肥厚劳损","完全性右束支传导阻滞","左束支传导阻滞","左心室肥厚劳损","右束支传导阻滞"]
某套管内径φ120mm,外径φ152mm,问:横截面积是多少平方米?S=(π/4)D2(精确到小数点以后两位数)