判别下列数列的收敛性：

A . 不收敛 B . 收敛到a C . 收敛到0 D . 可能不收敛，也可能收敛到a

A、丹尼尔·伯努利 B、奥古斯丁·路易·柯西 C、雅各布·伯努利 D、路易吉·圭多·格兰第

A . 正确 B . 错误

A . 如果所有的自相关系数都近似地等于零，表明该时间数列属于平稳性时间数列 B . 如果r 比较大，r 、r 渐次减小，从r 开始趋近于零，表明该时间数列是随机性时间数列 C . 如果r 最大，r 、r 等多个自相关系数逐渐递减但不为零，表明该时间数列存在着某种趋势 D . 如果一个数列的自相关系数出现周期性变化，每间隔若干个便有一个高峰，表明该时间数列是季节性时间数列

A、0.9,0.99,0.999,0.9999,… B、<img src="https://p.ananas.chaoxing.com/star3/origin/b1cfbfdfddb0e0f3c67a9477ee6a8574.png"> C、2,4,6,8,… D、<img src="https://p.ananas.chaoxing.com/star3/origin/c63d649f670bc58ab72f729807b93629.png">…

<img src='https://img2.soutiyun.com/ask/2021-01-13/979376296455647.jpg' /> <img src='https://img2.soutiyun.com/ask/2021-01-13/979376311773524.jpg' />

C．2,4,6,8,．．．． D．

<img src='https://img2.soutiyun.com/ask/2020-08-19/9666965590397.png' /><img src='https://img2.soutiyun.com/ask/2020-08-19/966696565618076.png' /><img src='https://img2.soutiyun.com/ask/2020-08-19/966696572187452.png' /><img src='https://img2.soutiyun.com/ask/2020-08-19/966696579021843.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-03/981198237092426.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-07/976216098402209.png' />

<img src='https://img2.soutiyun.com//1/2021-05-19/990310963658733.png' />

<img src='https://img2.soutiyun.com/ask/2021-03-11/984303215124168.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-21/977434147244721.png' />

<img src='https://img2.soutiyun.com/ask/2020-12-22/977477173109151.png' />