您要查找的是不是：
- fast direct current amplifier 快直流放大器
- Design of Practical Direct Current Amplifier 实用直流放大器的设计
- 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
- Direct current amplifiers--Characteristics and test methods 直流放大器特性和测试方法
- direct current amplifier 直僚大器,值僚大器
- 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。
- 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。
- A device, such as a diode, that converts alternating current to direct current. 整流器; 整流管一种将交流电流转化为直流电流的装置，如二极管
- DA includes: framework, power part, amplifier electrical source, excitation commutating part, direct current generatrix and AC generatrix and logic part. DA系列开关功率放大器包括：机架，功率模块，功放电源模块，激磁整流模块，直流母线，交流母线和逻辑模块。
- Maglev chopper is the switch mode current amplifier on EMS maglev train,and the input current ripple is significant. 悬浮斩波器是EMS型磁浮列车上的开关型电流放大器,由此造成输入电源的电流纹波较大。
- Direct current cannot use transformers to change voltage. 直流电就不能用变压器来改变电压。
- How Improve The Influence of Direct Current Drive on The LCD? 如何改善直流驱动对液晶显示器的影响?
- A device for converting alternating into direct current. 把交流变为直流的器件。
- A generator, especially one for producing direct current. 发电机发电机，尤指能产生直流电的那种
- A device that provides medium-capacity random access. It is designed for use as an extension of internal main memory, main storage for operating system and working programs, or where fast direct access is the primary consideration. 一个提供中等容量的随机存取设备,设计为内存的扩充,作为操作系统和工作程序的主存储器,或在主要考虑快速直接存取的地方使用。
- The units are available for either alternating or direct current. 这些装置既可以用交流电，或可以用直流电。
- The system can measure the direct current frequency acceleration. 该系统可以测量频率低至直流的加速度。
