He has a bicycle with lights powered by a dynamo.
他
上
灯
机提供能源。
机He has a bicycle with lights powered by a dynamo.
他上灯机提供能源。
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.
摘要介绍了上使用花鼓式机演变过程，分析了所用磁石，即铁氧体或钕铁硼性能优劣，并进了市场前景展望。
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