extremely low frequency emission超低频放射;翻译;超低频发射
extremely low frequency transmitting超低频发射
extremely low frequency propagation[电子] 极低频传播
extremely low frequency field工频电场
Extremely Low Frequency Radiator极低频电磁辐射器
extremely low frequency antenna极长波天线
ELF extremely low frequency极低频
Extremely Low Frequency Electromagnetic Field研究极低频率电磁场;观察极低频电磁场;极低频率电磁场
extremely low frequency magnetic fields极低频磁场
N（名词） a radio frequency or radio-frequency band below 3 kilohertz (低于3千赫的)极低频 ( abbr: ELF)