已知极限则a=0,b=6（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/b97eda7869144de1b30a6b2cb3e0fdfc.png
举一反三
- x=0是的（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/7bf81bd79b3b46eb957c2f17d30c395a.png
- 极限（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/438ba2a8b5b4417ab42253a5c8410dd6.png
- 设函数，则x=0是的（ ）https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/ad3e899cd2ee4898a97bfad0fc668313.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
- 下面的表达式中，正确有？ A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/0e169fdf5e354dd4af80ea6386ddeca5.png"/> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/5124889b558b4186ba4140ca7692d717.png"/> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/f3d2d0d80b744f74899371cae0395a71.png"/> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201911/2af6ef9203e94ea2b993e1ad4d99e5d2.png"/>