“明永乐“天字”铜手铳”的概念、定义、翻译、参考文献-科学参考

单词	明永乐“天字”铜手铳
释义	明永乐“天字”铜手铳 Encyclopedia 历史学中国古代科技文物释 Bronze Gun with the Inscription“Tianzi”of the Yongle Reign,Ming Dynasty明永乐“天字”铜手铳中国明代永乐十九年（1421）制轻型火铳。
随便看	navigational satellite navigational sports navigational star navigational star number navigational time scale navigational triangle navigation and positioning navigation and positioning on the sea navigation and search on complex network navigation aqueduct navigation brain system navigation by earth reference navigation by map-matching navigation by space reference navigation channel of Xijiang River navigation clock navigation constellation navigation coordinate system navigation delay calibration navigation disease monitoring navigation electronic map navigation electronic warfare navigation element navigation engine navigation epidemiology

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。