—Mum, it is nice weather. I want to skate this afternoon.
—Don't you think the ice on the lake is too thin to ______ your weight

A. stand



B. bear
C. catch



D. take

两样本方差齐性检验的特点（）

A.F＜1

B.F可大于1，也可以小于l

C.F值愈大，P值愈小

D.值愈大，P值愈大

E.以上都不正确