为调查池塘中草鱼的种群密度用渔�捕获了70条鱼其中草鱼20条做标记后又放回池塘半个月后又捕获了60条鱼其中有标记的草鱼6条没有标记 Template




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tomski为调查池塘中草鱼的种群密度用渔�捕获了70条鱼其中草鱼20条做标记后又放回池塘半个月后又捕获了60条鱼其中有标记的草鱼6条没有标记 coloring