题目内容：
电缆的稳定由厂家保证，选择电缆时可以不必考虑。参考答案：
选择题：电缆的稳定由厂家保证，选择电缆时可以不必考虑。
- 题目分类：西安交通大学发电厂电气设备
- 题目类型：选择题
- 查看权限：VIP
己知随机变量X服从二项分布B(n, p), 则( )(A)E(2X-1)=2np(B)E(2X
己知随机变量X服从二项分布B(n, p), 则( )(A)E(2X-1)=2np(B)E(2X+1)=4np +1(C)D(2X-1)=4np
The teacher seldom let an opportunity to teach his
The teacher seldom let an opportunity to teach his students or to help them make
It was not until dark___ he found _____ he thought
It was not until dark___ he found _____ he thought was the way to solve the prob
设A，B为随机事件，若( ) , 则A，B相互独立。(A)AB=Φ(B)P(AB)=0(C
设A，B为随机事件，若( ) , 则A，B相互独立。(A)AB=Φ(B)P(AB)=0(C)P(āB)=P(ā)P(B)(D)A∪B=
设二次型f(x1,x2,x3)=x1^2 + 2x2^2 -2x1x2 + x3^2则f是() A.
设二次型f(x1,x2,x3)=x1^2 + 2x2^2 -2x1x2 + x3^2则f是() A.负定 B.正定 C.半正定 D.不定