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一、稀土类磁体发展大致可分为四个阶段:1976—1979年为创始期,磁体重量0.1—0.01g/个1979—1981年为确立期,磁体重量1—10g/个
First, the development of rare earth magnets can be divided into four stages: 1976-1979 for the founding period, the magnet weight 0.1-0.01g / a 1979-1981 for the establishment of the magnet weight 1-10g /