已知a>b，二次三项式对于一切实数x恒成立．又，使成立，则的最

已知a>b，二次三项式对于一切实数x恒成立．又，使成立，则的最小值为（）

A．1 B． C．2 D．2

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已知a>b，二次三项式对于一切实数x恒成立．又，使成立，则的最

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