若随机变量X,Y独立，则。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/00c4d1e4a20d4a95bb7654c7eec93ac8.png
举一反三
- 若随机变量X,Y满足，则。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/a0b66ace257a4e1a93e06690c8f2047d.png
- x(t)的频谱为<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/5bcfe4175fcb4fabbdb5f40d00b5343e.png"/>，则<img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/45b1670ebd6245ff99cc376a8048a645.png" />的频谱为（ ） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/09bc7326832a4a1fba983e74c6d85d35.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/95fca346a74e4a6cbba601cd6d9e26bf.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/6bf6b83111ad45efac7eb9a37a245c68.png"/> D: 其余选项都不对
- 若，则（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/72bcab7a9a534faf8d3f5d65db5dd498.png
- 若，则（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/e2c6072ec7f1492cb1400e58229e54f2.png
- 若随机变量， 且则二维随机变量服从二维正态分布。https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/06902c8739054c2686716051f5d8b3fd.png