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问题 选择题

民族精神在增强我国国际竞争力中的作用表现在                (    )

①凝聚和动员民族力量、展示民族形象   ②有利于促进经济发展，增强综合国力 

③我国的民族精神是以爱国主义为核心   ④民族精神是综合国力的基础

A．①②

B．③④

C．①④

D．②③

答案

答案：A

解答题

已知二次函数f(x)＝ax2＋bx＋c图象的顶点为(－1，10)，且方程ax2＋bx＋c＝0的两根的平方和为12，求二次函数f(x)的表达式．
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单项选择题

Virtualization is an approach to IT that pools and shares (86) so that utilization is optimized and supplies automatically meet demand. Traditional IT environments are often silos, where both technology and human (87) . are aligned around an application or business function. With a virtualized (88) , people, processes, and technology are focused on meeting service levels, (89) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (90) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

A．solutions

B．networks

C．interfaces

D．connections
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