在对某地麻雀的种群调查中第一次捕获了50只麻雀将这些麻雀腿上套上标志环并放掉数日后又捕获麻雀40只其中有标记环的为5只请计算该地约有 Template




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tomski在对某地麻雀的种群调查中第一次捕获了50只麻雀将这些麻雀腿上套上标志环并放掉数日后又捕获麻雀40只其中有标记环的为5只请计算该地约有 coloring