Littre疝是指嵌顿的疝内容物是
A．小肠憩室B．大网膜C．单个小肠肠襻D．部分小肠肠壁E．多个小肠肠襻
参考答案：A
The coffee is wonderful! It doesn't taste like anything I _____ before. [ ]
A. was having
B. have
C. have ever had
D. had ever had
逆行造影的禁忌症（）
A.下尿路感染
B.尿路阴性结石
C. * * 狭窄
D.膀胱肿瘤
E.泌尿系结核
