“成化大旱”的概念、定义、翻译、参考文献-科学参考

单词	成化大旱
释义	成化大旱 Encyclopedia 工学〔中国历史上重大的水旱灾害〕释 severe drought in Chenghua period of Ming Dynasty成化大旱明代成化年间发生在黄河中下游地区的一场持续三年的全国性大旱灾。
随便看	frequency spectrum frequency stability frequency stability criterion frequency stability measurement frequency stabilization frequency stabilized laser frequency standard frequency standards frequency step frequency sweep mode frequency swept laser frequency switching frequency synchronization frequency synthesis frequency synthesized signal generator frequency synthesizer frequency table frequency theorem frequency theory frequency theory of probability frequency thermometer frequency transition frequency upconversion frequency value measurement frequency-varying induced polarization instrument

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。