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Evolving process of hub dynamo which used in bicycle is presented. The performance of magnetite viz. ferrimagnetism or NdFeB is analyzed. The prospect of marketing is viewed.

了自车上使用的花鼓式发电机的演变过程,析了所用磁石,即铁氧体或钕铁硼的性能优劣,了市场前景展望。

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3G, 401(K), a,

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