若函数在点处连续，则（　）是正确的．

<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image057.png" alt="" align="middle">，但<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image058.png" alt="" align="middle">

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image055.png" alt="" align="middle">在<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image056.png" alt="" align="middle">点处可导

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image055.png" alt="" align="middle">在<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image056.png" alt="" align="middle">点处可微

函数<img src、"http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image055.png" alt="" align="middle">在<img src="http://oss.ouchn.cn/ddzx/N601/gongxue/jjsx/img/1-3/image056.png" alt="" align="middle">点处有定义