12月22日，一群野鸭和鸳鸯聚集在北海公园太液池上。图/IC photo
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若按研发投入规模，将企业划分为千亿、百亿、十亿、亿及千万元等不同区间，我们发现研发资源的集中趋势尤为显著，头部企业在创新活动中发挥引领作用。