“Beijing City”的概念、定义、翻译、参考文献-科学参考

单词	Beijing City
释义	Beijing City Encyclopedia 工学明代建筑释 Beijing City北京城中国明清两代都城。建于明初（1421年起），是在元大都的基础上改建和扩建而成的，清代沿用并有所增修。
随便看	constant probability constant problem constant progression constant propagation constant quantity constant random variable constant rank constant-rank mapping constant-rank morphism constant-ratio head constant region constant release constant sale books constant sheaf constant species constant specific mass flow pattern constant speed constant frequency constant speed drive unit constant-speed mercury intrusion constant speed motor/generator constant stratum constant stress test constant sum game constant-sum game constant surface

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。