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【单选题】
下列结论中不正确的是( )．A.
若f’(x 0 )=0，f"(x 0 )=0，则不能确定点x=x 0 。是否为函数的极值点
B.
若x=x 0 是函数f(x)的极值点，则f’(x 0 )=0或f’(x 0 )不存在
C.
函数f(x)在区间(a，b)内的极大值一定大于极小值
D.
f’(x 0 )=0及f’(x 0 )不存在的点x=x 0 ，都可能是f(x)的极值点
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A.
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B.
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C.
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D.
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