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field method
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field method
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实地调查法
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field method
实地调查法
在自然状态下直接观察研究对象一段时间,并收集若干变量数据以形成结论的一种调查方法。又称现场研究或田野工作。
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derived algebra
derived automorphism
derived block design
derived category
derived complex
derived constant
derived curve
derived design
derived dyad
derived element
derived equation
derived equivalent algebra
derived exact couple
derived form
derived fossils,secondary fossil
derived fuel
derived function
derived function of higher order
derived functor
derived gene effect
derived geometric object
derived graph
derived group
derived ideal
derived language
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