在生态系统中能量沿食物链各个环节传递时其特点是a.单�传递逐级不变b.单�传递逐级递减c.循环流动逐级增加 D.循环流动逐级递减 Template




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tomski在生态系统中能量沿食物链各个环节传递时其特点是a.单�传递逐级不变b.单�传递逐级递减c.循环流动逐级增加 d.循环流动逐级递减 coloring