研发投入分布特征与研发投资强度影响因素的分析——基于我国30万个工业企业面板数据
연발투입분포특정여연발투자강도영향인소적분석——기우아국30만개공업기업면판수거
The Distribution of R&D Investment and Influence Factors of R&D Intensity Based on 300,000 Industrial Enterprises' Panel Data in China
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