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聚焦CSIRO_2024从矿产到材料:澳大利亚关键矿产中游加工能力评估报告。R&D Research and development RD&D Research, development and demonstration RE Rare earths SPG Spherical purified graphite SX Solvent extraction Definitions 2N–11N The level of purity of a product, for instance 2N corresponds to 99% purity and 11N to 99.999999999%.