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對於可導函數f(x)=x3,f'(x)=3x2,f'(0)=0,不能推出f(x)在x=0取極值,故導數為0時不一定取到極值,而對於任意的函數,當可導函數在某點處取到極值時,此點處的導數一定為0.故應選 ;C.
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