BD：射频波段

“Radio-frequency Band”（射频波段）在专业领域中常被缩写为“BD”，这种简写形式便于快速记录和应用。该缩写在美国航空航天局（NASA）等机构的文档和技术交流中尤为常见。

Finally, it had explained the radio-frequency spectrum resources importance, the characteristic as well as the multi-frequency band naming, and proposed the measure of frequency spectrum resource management.
最后阐释了无线电频谱资源的重要性，特性以及多频段的命名，并提出了频谱资源管理的措施。
The band width of the radio-frequency signal for the spread spectrum communication can be spreaded to several times or even thousands of times the band width of the information signal.
扩频通信的射频信号频带宽度，可扩展到信息信号频带宽度的数倍乃至数千倍。
The nc-Si / SiNx superlattice films was prepared by radio-frequency ( RF ) magnetron sputtering technique and thermal annealing. The films has been tested microstructure, optical band gap and nonlinear absorption coefficient.
采用射频磁控反应溅射和热退火方法制备纳米Si/SiNx超晶格薄膜，测定薄膜的微观结构、光学带隙和非线性吸收系数。

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