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若在[a,b]上连续,在(a,b)可导,则在(a,b)内()。
A.至少存在一点ζ,使f'(ζ)=0B.至多存在一点ζ,使f'(ζ)=0C.一定不存在一点ζ,使f'(ζ)=0D.不一定存在一点ζ,使f'(ζ)=0
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