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secondary producer

网络次级生产者；二级生产者

secondary producer

secondary producer

secondary producer

次级生产者

从事次级生产的人称为次级生产者(Secondary Producer)﹔而产品称为次级产品(Secondary Product)。三级生产，是指服务性 …

二级生产者

从事第二级生产的人称为第二级生产者(Secondary Producer)﹔而产品称为第二级产品(Secondary Product)。第二级生产是第 …

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