“Umar II's reform of taxation system”的概念、定义、翻译、参考文献-科学参考

单词	Umar II's reform of taxation system
释义	Umar II's reform of taxation system Encyclopedia 历史学〔综述〕释 Umar II's reform of taxation system欧麦尔二世税制改革阿拉伯帝国倭马亚王朝后期哈里发欧麦尔二世（全名欧麦尔·阿卜杜勒·阿齐兹，717～720年在位）为缓和社会矛盾而实行的税收改革。
随便看	single premium single-prism spectrograph single-prism spectrometer single-prism spectroscope Single product principle single program multiple data single program multiple data, SPMD single prop single pulse discharge energy single pulse TDS single-quadrant Cùk circuit single-quadrant DC converting circuit single quadrupole single qualitative weighted scoring method single-quantum annihilation single quantun well single-qubit quantum gate single-railed camera, monorail camera single rapping knitting machine single reaction single reference electron correlation method single reference electron correlation methods single replicate design single replication experiment single roller rapid quenching

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。