设在点处均有导数,关于导数的性质下列结论中错误的是( ).

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627259871_8f1e7f1dcfb74106aab090a36e5c29a9.png">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627267963_65a4fdc0e6774f12bee79de2a1797b45.png" style="font-size: 14px;">为常数.

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627273468_080a73bae325444a8e8f33b03d11bca9.png">

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1620627278450_a25f629bb520424bae5d5a298c947e1d.png">