多尺度知识溢出研究——以进出口互动效应为例
Research on knowledge spillovers at different scales: Taking the interaction effect between import and export as an instance
注：此图基于国家测绘地理信息局标准地图（审图号：GS（2019）1825）绘制,底图无修改。
多尺度知识溢出研究——以进出口互动效应为例 |
| 刘君洋, 朱晟君 |
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Research on knowledge spillovers at different scales: Taking the interaction effect between import and export as an instance |
| LIU Junyang, ZHU Shengjun |
| 图2 研究时间段内各地级市新进口和新出口产品种类数均值 注：此图基于国家测绘地理信息局标准地图（审图号：GS（2019）1825）绘制,底图无修改。 |
| Fig. 2 The mean value of new varieties of imported and exported products in prefecture cities during the research period |
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