1.
Operation From DC Power Supply: Batteries.
使用直流电源：干电池。
2.
circuit design, wiring diagrams, schematics, AC/DC sources
电路设计, 接线图, 示意图, 交流/直流电源
3.
Automatic exchange for DC and AC supply.
直流电源与交流供电能自动转换。
4.
The Research on Rectifier DC Electrical Source for Electrolyzing Cuprum and Monitor Technique;
电解铜整流直流电源及监控技术研究
5.
To run a direct motor, we must connect it to a direct current source.
要开动直流电机，我们必须把它接到直流电源上。
6.
Selection of DC control protection component in DC power supply system
直流电源系统中直流控制保护电器的选择
7.
Research on Electric Power Operation DC Power System in Transformer Substation;
变电站电力操作直流电源系统的研究
8.
Resistance thermometer bridges may be excited from either a-c or d-c sources.
电阻温度计电桥的供电可以是交流电源，也可以是直流电源。
9.
The Soft-Switching of High-Frequency DC Charger System;
高频直流电源充电系统的软开关实现
10.
Design of High Voltage Direct Current Power Supply Based on IR2153;
基于IR2153的高压直流电源电路设计
11.
On-line insulation monitoring of substation DC power supply
变电站直流电源绝缘在线监测新方法
12.
AC current or voltage source. DC offset can be specified.
交流电流源或电压源。可指定直流偏移。
13.
combined a.c. and d.c. welding power source
交直流两用弧焊电源
14.
transistorized regulated DC power supply
晶体管直流稳压电源
15.
Low voltage DC power is also provided for control power and emergency power.
低压直流电作控制电源和应急电源。
16.
Study on Active Fiber DC Transducer Used in HVDC;
高压直流输电有源光纤直流电流传感器的研究
17.
DC current or voltage source. Magnitude of AC component can be specified.
直流电流源或电压源。可指定交流分量的大小。
18.
Study of constant-current source for measuring DCR of large electric power equipment
电力设备直流电阻测量用恒流源研究