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field trial
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field trial
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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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divisorless ideal
divisor number
divisor of a differential
divisor of a differential form
divisor of a function
divisor of an integer
divisor of a number
divisor of a polynomial
divisor of degree zero
divisor of the discriminant
divisor of the poles
divisor of the zeros
divisor of unity
divisor of zero
divisor problem
divisor product
divisor sum
divisor sum function
divisor theory
Divorce
divorce
divorce by agreement in ancient China
divorce digraph
Divorce Italian Style
Diwali
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