单项选择题
In the early days of PCBs, the design and layout was undertaken manually. Nowadays the PCB design process has been computerized and there are many PCB CAD softwares that enable the PCB layout and design to be undertaken more efficiently than before. A.
手动操作 B.
设计更有效 C.
计算机化 D.
计算机辅助设计软件
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