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现场试验
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现场试验
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现场试验
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field trial
现场试验
在社区的现场条件下,以尚未患某病的人作为研究对象,按随机分配原则将研究对象分为实验组和对照组,实验组给予某种干预措施(研究因素),对照组不给予干预措施或给予安慰剂,比较两组结局的方法。又称人群预防试验。
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two dimensional superlattice
two-dimensional superlattice
two-dimensional synthesis
two-dimensional system
two dimensional system conrolability
two dimensional system observability
two-dimensional systems
two-dimensional theory
two dimensional topological insulator
two-dimensional tracking
two-dimensional tracking, 2D tracking
two-dimensional transformation
two dimensional turbulence
two dimensional ultrafast spectroscopy
two-dimensional ultrafast spectroscopy
two-dimensional vector space
two-dimensional vorticies
two dimensional waveguide
two-dimension design of concentrators
two-dimension photometry
two dimension semiconductor
two-dimension semiconductor
two-dimentional electron gas
two-disk phosphoroscope
two-D NMR logging
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