“sky wave propagation for low frequency”的概念、定义、翻译、参考文献-科学参考

单词	sky wave propagation for low frequency
释义	sky wave propagation for low frequency Encyclopedia 工学电离层电波传播释 sky wave propagation for low frequency低频天波传播地面发射的频率为30～300千赫的无线电波，经电离层反射再回到地面的传播方式。
随便看	topological metal topological method topological microbundle topological model topological module topological nature topological nearness space topological node topological n-sphere topological object topological obstruction topological Omega stability topological Omega-stability topological order topological ordered simplex topological pair topological parameter topological partial algebra topological phase space topological phase transition topological polygon topological polyhedron topological prediction topological pressure topological primitive

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。