四川省西昌市河谷阶地沟渠感染性钉螺分布与负二项分布配合适度的检验
사천성서창시하곡계지구거감염성정라분포여부이항분포배합괄도적검험
To fit infected snail in Xichang City,Sichuan mountainous terrace area with negative binomial distribution
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