若函数在点处可导，则（　）是错误的．

<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image057.png" alt="" align="middle">，但<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image058.png" alt="" align="middle">

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image055.png" alt="" align="middle">在点<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image056.png" alt="" align="middle">处可微

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image055.png" alt="" align="middle">在点<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image056.png" alt="" align="middle">处连续

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image055.png" alt="" align="middle">在点<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1/image056.png" alt="" align="middle">处有定义