A. f（x，y）的极值点一定是f（x，y）的驻点
B. 如果P0是f（x，y）的集值点。P0点处B2-AC<0（其中，
C. 如果P0是可微函数f（x，y）的极值点，则在P0点处df=0
D. f（x，y）的最大值点一定是f（x，y）的极大值点
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