| 1. | Study on vibration sensor of ultra - low frequency
超低频振动传感器的研究 |
| 2. | Verification regulation of super - low frequency signal generator
超低频信号发生器检定规程 |
| 3. | Study on ultra - low frequency vibration sensor
超低频振动传感器的研究 |
| 4. | Design and realization of ultra - low frequency signal - generator
超低频信号发生器的设计与实现 |
| 5. | Model 991 ultra - low frequency vibration gauge
991型超低频测振仪 |
| 6. | 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 |
| 7. | Super low frequency therapeutic apparatus
超低频治疗机 |
| 8. | 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 |
| 9. | 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 |
