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将某一特定人群按是否暴露于某可疑因素或暴露程度分为不同的亚组,追踪观察两组或多组成员结果(如疾病)发生的情况,比较各组之间结果发生率的差异,从而判定这些因素与该结果之间有无因果关联及关联程度的一种观察性研究方法。
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①跟踪,随动 ②随动系统
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three-phase commitment protocol
three-phase contact line
three phase current
three phase electronic watt hour meter
three-phase five-wire system
three-phase flow
three phase four wire system
three-phasefour-wire system
three-phase froth
three phase full wave rectified automatic magnetic particle test equipment
three phase induction meter
three-phase induction motor
three-phase loads
three phase power
three-phase relative permeability
three-phase single-phase hybrid system
three-phase sources
three-phase state
three phase three wire system
three-photon process
three photon scattering
three-photon scattering
Three-piece Cooke Lens
three-planning integration
Three Poetic Inscriptions on Plum and Bamboo Paintings
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