abbr.power circuit breaker 电源断路器
Trouble shooting at components level to PCB module under engineer's instruction.
在工程师指点下进行对PCB模块进行元件级维修.
Hole Density: The number of holes per unit area on a PCB.
孔密度: PCB上单位面积上的孔数.
Each process is a process control block ( PCB ) said.
每个进程有一个进程控制块 ( PCB ) 表示.