小儿肠套叠的特点是()
A.好发于2岁以下儿童
B.多为小肠套入小肠
C.早期可试用空气灌肠治疗
D.常有血便
E.腹部可触及肿块
参考答案:A, C, D, E
He said ______ at the meeting and just sat there silently.
A.something
B.anything
C.nothing
D.everything
末梢神经阻滞常用乙醇浓度为()
A.10%~30%
B.40%~50%
C.60%~80%
D.75%~90%
E.99%以上