设，则在x=0处（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/96c2ccdec9244e27b055825477e40091.png
举一反三
- 设，则在点x=0处（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/88d2ae5f9788463a8708a18b0e120e86.png
- 设，则在点x=0处（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/66fa75eecd1449f8a6d71ba4c0730ef6.png
- 设函数，则x=0是的（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/ad3e899cd2ee4898a97bfad0fc668313.png
- x=0是的（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/7bf81bd79b3b46eb957c2f17d30c395a.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