【单选题】If a prediction based on a hypothesis is fulfilled, then the hypothesis is confirmed as true.
【单选题】Regarding null hypothesis and alternative hypothesis , which one is wrong ( ).
A.
generally,a null hypothesis state that there’s no difference between the two populations.
B.
null hypothesis and alternative hypothesis are mutually exclusive, and only one can be true.
C.
the alternative hypothesis is effectively the opposite of a null hypothesis
D.
the two hypotheses are certain hypotheses for the sample
E.
the two hypotheses are certain hypotheses for the population
【简答题】试辨认分类编址方式中以下 IP 地址的网络类别
【单选题】is NOT Krashen ’ s hypothesis
A.
The monitor hypothesis
B.
The o ut put hypothesis
C.
The natural order hypothesis
D.
The learning hypothesis
【简答题】用区间正确表示下列不等式表示的数值范围; (1)x>3←→左括号 ;左端点 ;右 端点 ;右 括号 ; (2)x≤3←→左括号 ;左端点 ;右 端点 ;右 括号 ; (3)全体实数R←→左括号 ;左端点 ;右 端点 ;右 括号 ;
【单选题】短期产量曲线表现为先递增上升,然后递减上升,最后下降,则在生产要素投入的第一阶段
B.
总产出上升,平均产出上升,边际产出先上升后下降
C.
总产出上升,平均产出先上升后下降,边际产出先上升后下降
D.
总产出上升,平均产出上先上升后下降,边际产出上升