超低频

• Study on vibration sensor of ultra - low frequency
  超低频振动传感器的研究
• Verification regulation of super - low frequency signal generator
  超低频信号发生器检定规程
• Study on ultra - low frequency vibration sensor
  超低频振动传感器的研究
• Design and realization of ultra - low frequency signal - generator
  超低频信号发生器的设计与实现
• Model 991 ultra - low frequency vibration gauge
  991型超低频测振仪
• Analysis and design of a new ultra - low frequency power source
  一种新型超低频电源的系统分析与设计
• Super low frequency therapeutic apparatus
  超低频治疗机
• Development of a hydraulic vibration drilling apparatus on ultra - low frequency
  超低频液压振动钻孔装置的分析
• Research and realizing of ultra low frequency geomagnetic signal proceeding system
  超低频地磁信号谱分析系统研究与实现