“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	diffusion controlled reaction diffusion-controlled reaction diffusion controlled termination diffusion controlled wave diffusion-controlled wave diffusion control reaction diffusion convection diffusion-convection equation diffusion creep diffusion current diffusion.current diffusion current density diffusion damping diffusion dialysis diffusion effect diffusion equation diffusion factor diffusion field diffusion for transitional region diffusion front diffusion gradient diffusion index diffusion-induced instability diffusion in geography diffusion in metal

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。