“upper-and-lower groups design(ULGD)”的概念、定义、翻译、参考文献-科学参考

单词	upper-and-lower groups design(ULGD)
释义	upper-and-lower groups design(ULGD) 高低组设计
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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。