设为随机变量, 为随机变量, 为随机变量,
设为随机变量,
设为随机变量,,则
A.-6
B.-2
C.2
D.6
正确答案是D
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/273399.html
上一篇:Words which were used to designate one thing but later changed to mean something else have experienced the process of semantic______.
下一篇:上市公司是指( )