[单选题]
下面等式正确的是（　　）．
A、
B、
C、
D、

参考答案:A

参考解析:
将式中的微分计算出来，比较左、右两边的式子，可知选项A正确．

更多"下面等式正确的是（）．"的相关试题:

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A、I
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