如图所示出生率死亡率和种群密度的关系据此分析得出的正确表述是 A.在$frac{k}{2}$时控制有害动物最有效b.图示规律可作为 Template




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tomski如图所示出生率死亡率和种群密度的关系据此分析得出的正确表述是 a.在$frac{k}{2}$时控制有害动物最有效b.图示规律可作为 coloring