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。
Opens in a new window，更多细节参见safew官方版本下载
error prone. Maybe the compiler can do this transformation for us?。同城约会对此有专业解读
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