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稀有金属具有许多新的功能,作为高技术材料,要求其纯度高。为此,日本科技厅组建了一个专门的调查促进委员会,对55种
Rare metals have many new features that require high purity as a high-tech material. To this end, the Japanese Agency for Science and Technology set up a special investigation promotion committee, to 55 kinds