在PCB设计中，下列哪个层是用于定义电路板上有效放置元件和布线的区域（）。A、Signal layerB、Top layerC、Bottom layerD、Keep out layer
在PCB设计中，下列哪个层是用于定义电路板上有效放置元件和布线的区域（）。
- A、Signal layer
- B、Top layer
- C、Bottom layer
- D、Keep out layer
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