当样本含量n固定时,选择下列哪个检验水准得到的检验效能最高()
A、α=0.01
B、α=0.05
C、α=0.10
D、α=0.20
参考答案:D
For quite a number of children, their teachers’ advice is more acceptable than ____ of their parents.
A.one
B.that
C.which
D.what
女性。既往十二指肠溃疡病史10年,着凉后上腹部疼痛,2天前突然呕咖啡样胃内容物,排柏油样便,随后晕厥。估计出血量()
A.400ml
B.500ml
C.600ml
D.800ml
E.1000ml以上