... 主电源：main power supply 主电压：principal voltage 主电线，输电干线：electric main ...
双语例句
1
We have a lot of parameters to choose transistor, but when we use it in controlled rectification, the specified electric current and the specified voltage are the principal ones.
晶闸管的选择参数很多，但用于可控整流时，主要是额定电流、额定电压的计算与选择。
2
The Company's principal product categories include amplifiers, battery management, data converters, high frequency, interface, voltage regulators and voltage references.
该公司的主要产品门类涵盖放大器、电池管理、数据转换器、高频、接口、电压调节器和电压基准。
3
The principle figures of input stage middle gain stage and output stage for a usual two stage low-voltage CMOS operational amplifier and their principal performance are presented in the paper.