循环经济型城市与区域发展政策研究——以黄河三角洲高效生态经济区为例
순배경제형성시여구역발전정책연구——이황하삼각주고효생태경제구위례
A study on the development policies of circular economy cities and region economy——Taking Huanghe River delta high-efficiency ecological economy region as an example
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