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生态趋势研究
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ecological trend study
生态趋势研究
连续观察目标人群中某因素平均暴露水平的改变和某种疾病的发病率、死亡率变化的关系,了解其变动趋势;或者通过比较暴露水平变化前后疾病频率的变化情况,来判断两者间关系的群体研究。
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algebraic class group
algebraic closed field
algebraic closedness
algebraic closure
algebraic closure operator
algebraic cocycle
algebraic code
algebraic coding
algebraic coding theory
algebraic cofactor
algebraic coherent sheaf
algebraic cohomology class
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algebraic complete partial order, algebraic CPO
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