systematic sampling短语¹³¹⁶²⁰⁺³ 基本例句 系统抽样,等间隔抽样,系统抽样法,系统化采样 Systematic Sampling is the basic method in forest resource research. The paper presents the development and applications of systematic sampling program. 简单随机抽样是森林资源调查中最基本的方法，介绍简单随机抽样程序的开发及应用。 kns50.chkd.cnki.net