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碲 化学项目 指标 LOT 021 LOT 013 LOT 014 TE 99.9654% 99.9603% 99.9538% FE 3ppm 3ppm 5ppm PB 14ppm 45ppm 20ppm CU 35ppm 25ppm 45ppm AG 40ppm 20ppm 13ppm SB 1ppm 1ppm 1ppm BI 50ppm 100ppm 75ppm HG <20ppm <20ppm <20ppm SN 1ppm 1ppm 1ppm CD 1ppm 1ppm 1ppm SE 200ppm 200ppm 300ppm AL 1ppm 1ppm 1ppm