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">
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在点
处均有导数,关于导数的性质下列结论中错误的是( ).