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关键矿产战略国际比较——历史演进与工具选择
葛建平(), 刘佳琦
International comparison of critical mineral strategies: Historical evolution and tool selection
GE Jianping(), LIU Jiaqi

图2. 4个国家(地区)关键金属矿产政策文本累计频次

Figure 2. Cumulative frequencies of critical mineral policy texts in the selected four countries (regions)