采用分层随机抽样法对长武王东沟小流域农业产业结构现状进行了调查分析。
This report analyzed the agricultural industry structure of Wangdonggou watershed in Changwu county based on investigation.
根据群落的垂直结构和成层现象，应用红外线CO_2气体分析法，分层测定了主要植物22种58株的光合速率。
The photosynthetic rates of 58 individuals of 22 main species at different layers of community were measured with an infrared CO_2 analyzer.
方法采用分层随机取样法对抽取的15名陆军军人进行结构式访谈。
Methods The 15 soldiers selected through a hierarchical sampling method were treated by an un-structured interview.
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