“cluster sampling”的概念、定义、翻译、参考文献-科学参考

单词	cluster sampling
释义	cluster sampling 分群抽样法整群抽样成串采样成群抽样密集样本分组取样集中采样
随便看	tree volume table tree-walk tree wall tree wart tree well tree wire tree work tree zone Trefanocide Treflan trefoil trefoil arch trefoil bur trefoil foamflower trefoil knot trefoil ornament trefoil sanicle trefoil stage trefoil tendon trehalase trehalosamine trehalose trehaloside Treitz's arch Treitz's fossa

科学参考收录了1248194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。