【简答题】400个“随机数”的头10个样本的自相关函数如下表所示: k 1 2 3 4 5 6 7 8 9 10 hat{rho} _k 0.02 0.05 -0.09 0.08 -0.02 0.01 0.12 0.06 0.02 -0.08 试问有无明显的非随机迹象?
【单选题】下列各组物质中,前者属于单质、后者属于混合物的是( )
【单选题】Which of these is not a legitimate example of Commutation? A.R v P commutes to P v R B.R→P commutes to P→R C.R & P commutes to P & R
【简答题】第二节 (共 10 小题 ;每小题 1. 5 分,满分 15 分 ) 阅读下面短文,在空白处填入 1 个适当的单词或括号内单词的正确形式 " In his book , Intentional Living , author John Maxwell shares that back in 1976, he received a gift from one of his 61 (assist ) ...
【简答题】已知二次函数f(x)=ax 2 +x有最小值,不等式f(x)<0的解集为A. (1)求集合A; (2)设集合B={x||x+4|<a},若集合B是集合A的子集,求a的取值范围.
【单选题】若集合A={(1,2),(3,4)},则集合A的真子集个数是( )
【简答题】Show that each of these conditional statements is a tautology by using truth tables. a) (p ∧ q) → p b) ¬ p → (p → q) c) ¬ (p → q) → p
【单选题】下列物质中前者属于纯净物,后者属于混合物的一组的是 [ ]