蛔虫证经久不治,可转化为()
A.蛔厥
B.肠结证
C.蛔疳
D.疳肿胀
E.以上均不是
参考答案:C
There is a little time left. We _____ hurry.
A.should
B.would
C.mustn’t
D.needn’t
目标人群失访超过多少,即可造成偏倚()
A.3%
B.5%
C.10%
D.13%
E.15%