下图是某种生物迁入生态系统后种群增长率随时间变化的曲线由此可以判断 A.种群数量先增大后减小 b.b点时种群数量最大 c.影响a点和c点 Template




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tomski下图是某种生物迁入生态系统后种群增长率随时间变化的曲线由此可以判断 a.种群数量先增大后减小 b.b点时种群数量最大 coloring