设函数f(x)在点x0处满足 '((x)_(0))=f'((x)_(0))=0 ^m((x)_(0))gt 0, 则 ()-|||-(A)f`(x0)是f`(x)的极大值 (B)f(x0)是f(x )的极大值-|||-(C)f(x0)是f(x )的极小值 (D)(x0,f(x0))是曲线 y=f(x) 的拐点