设<img src="https://static.zxtiku.com/wangke/imgs/topic/587db84b5ad52ccdb1f8adb9adbd82e8.jpg"/>则下列结论正确的是（）<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/913dbd3507b8db9feaf230ff4fa0b686.jpg"/>存在<br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/d6a54f1462c35bb773bf9493ff1cae5a.jpg"/>在点<img src="https://static.zxtiku.com/wangke/imgs/topic/6abbbe30056cb6593d94cf75b457404a.jpg"/>处连续<br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/c3e4c6297a0aadb3caeeccacb1bb9b75.jpg"/>都存在<br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/d6a54f1462c35bb773bf9493ff1cae5a.jpg"/>在点<img src="https://static.zxtiku.com/wangke/imgs/topic/6abbbe30056cb6593d94cf75b457404a.jpg"/>处可微