“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	free module free-molecule diffusion free-molecule flow regime free monoid free motion free motion of nonholonomic system free Motzkin path free nerve ending freeness free neutron free neutron decay free node free non-Abelian group free nuclear stage free nuclei free nucleon nucleon cross section free nucleon-nucleon cross section free nutation free object free occurrence Free Officers Movement free open policy free operator algebra free oscillation free oscillations of the earth

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。