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木通的来源有（）。
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没药来源于橄榄科植物没药树及同属其他植物树干皮部渗出的树脂。
鸡血藤具有偏心性髓部。
Thesellingconcept isbased on consumer-centric idea.( )
Social marketing concept requires marketers to consider interests of corporate profits, satisfaction of customer’s needs and social benefits in the development of making marketing policy.( )
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