“二阶抽样”的概念、定义、翻译、参考文献-科学参考

单词	二阶抽样
释义	二阶抽样 Encyclopedia 农学抽样调查释 two-stage sampling二阶抽样设总体由个初级单元组成，每个初级单元又由若干次级单元组成，在总体中按一定方法抽取若干初级单元，对每个被抽中的初级单元再抽取若干次级单元进行调查的方法。
随便看	earthquake mechanics earthquake nucleation on fault earthquake position earthquake precursors earthquake prediction earthquake prevention and disaster reduction law earthquake resistance of foundation Earthquake Science earthquakes in China earthquake source earthquake stress earthquake stress drop earthquake subsidence，seismic subsidence earthquake travel-time curve Earth quasi-satellite exploration Earth radiation belt earth radiation belt earth radiation budget detector Earth Radiation Budget Satellite earth radio radiation earth rate earth-rate unit Earth reflection sensor earth resources satellite earth resources technology satellites

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。