“non directional beacon”的概念、定义、翻译、参考文献-科学参考

单词	non directional beacon
释义	non directional beacon Encyclopedia 工学无线定位技术释 non directional beacon; NDB无方向信标放置在已知地点，用于航空或者航海方面定位的无线电发射装置。每台无方向信标导航台都有3个字母组成的标识。
随便看	poly (tetrafluoroethylene) polytetrafluoroethylene polytetrafluoroethylene fiber poly (tetrafluoroethylene) (PTFE) polytetrahydrofuran poly (tetramethylene terephthalate) poly (tetramethylene terephthalate); poly (butylene terephthalate) (PBT) poly(tetraphenylethylene) Poly Theatre polytheism polytheistic religion：polytheism polythioether polythionic acid polythiophene polythiophene (PT) polytomous data polytomous item response theory model polytomous items polytonality polytopal polytopal graph polytopal isomerism polytope polytope edge polytopes

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。