Copper Etching is an important step in the PCB production process.
蚀铜过程是生产线路板的一个关键步骤。
Each process is a process control block (PCB) said.
每个进程有一个进程控制块(PCB)表示。
Each process has a process control block (PCB) represented.
每个进程有一个进程控制块（PCB）表示。
Every process from a process control block (PCB) said.
每个进程由一个进程控制块(PCB)表示。
Every process from a process control block (PCB) said.
每个进程由一个进程控制块(PCB)表示。
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