下列属于生态系统中食物�特征的是 A.一种生物只能被另一种生物捕食b.食物链的环节数是无限的c.一种生物可能属于不同的营养级d.食物�上 Template




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tomski下列属于生态系统中食物�特征的是 a.一种生物只能被另一种生物捕食b.食物链的环节数是无限的c.一种生物可能属于不同的营养级d.食物�上 coloring