您要查找的是不是：
- E. W. Kimbark, Direct current transmission, Vol. 1, The John Wiley &Sons, U.S.A., 1971. 林文锵，船舶电力系统稳定度分析，海洋大学电机工程研究所硕士论文，民国90年6月。
- Additional highlights include flexible alternating current transmission systems (FACTS), high-voltage direct current (HVDC) systems and network management systems. 其他亮点包括灵活交流输电系统（事实） ，高压直流（高压直流输电）系统和网络管理系统。
- direct current transmission line 直龄电线路
- high voltage direct current transmission (HVDC) 高压直流输电
- high voltage direct current transmission 高压直流输电
- high voltage direct current transmission(HVDC) 直流输电
- flexible direct current transmission 柔性直流输电
- high voltage direct current transmission system 高压直流输电系统
- unipolar high voltage direct current transmission 单极高压直流输电
- high voltage direct current transmission electricity 高压直流输电
- ultra-high voltage direct current transmission (UHVDC) 特高压直流输电
- A device used to convert direct current into alternating current. 反用换流器用于变直流电为交流电的仪器
- Relative Problem Review of Ultrahigh Voltage Direct Current Transmission 特高压直流输电相关问题的综述
- Direct Current Governor System M? 直流调速系统?
- Direct Current Plasma Emission Spectrometer DCP M. 直流等离子体发射光谱仪。
- The Measures Enhancing System Dependability of Extra High Voltage Direct Current Transmission System 提高特高压直流输电系统可靠性的措施
- Alternating current,direct current. 交流电，直流电。
- Alternating current, direct current. 直流电，交流电。
- It also wks well under a low direct current. 在直流低电流下使用，很受欢迎。对于管道以及细小部件的焊接，继续焊接及特定数目焊接更具优势。
- OPTIMIZATION MODEL AND ALGORITHM OF TYPE-C DAMPED FILTER IN HIGH VOLTAGE DIRECT CURRENT TRANSMISSION SYSTEM 高压直流输电系统中C型阻尼滤波器的优化模型及其算法
