用Protel设计电子产品，需要设计人员首先确定其电路板的尺寸，因此首要的工作就是电路板的规划，通常在哪一个板层上来确定板得物理尺寸？（）A、Mechanical LayerB、Top LayerC、Bottom LayerD、Keep Out Layer
用Protel设计电子产品，需要设计人员首先确定其电路板的尺寸，因此首要的工作就是电路板的规划，通常在哪一个板层上来确定板得物理尺寸？（）
- A、Mechanical Layer
- B、Top Layer
- C、Bottom Layer
- D、Keep Out Layer
相关考题：
印制电路板的()层主要用于绘制元器件外形轮廓以及标识元器件标号等。该类层共有两层。A.Keep Out LayerB.Silkscreen LayersC.Mechanical LayersD.Multi Layer
● TCP/IP communication protocol contains four layers. From bottom to top, the four layers are __(71)__.（71）A．network interface layer, internet layer, transport layer and application layerB．internet layer, network interface layer, transport layer and application layerC．network interface layer, transport layer, network interface layer and application layerD．application layer, transport layer, internet layer and network interface layer
Which layer in the OSI model is responsible for translating frames into bits?() A. Application LayerB. Presentation LayerC. Data Link LayerD. Physical Layer
Which OSI layer does a bridge operate at?A．the Physical LayerB．the Network LayerC．the Transport LayerD．the Data Link Layer
TCP/IP communication protocol contains four layers. From bottom to top, the four layers are （ ） .A.network interface layer—internet layer—transport layer—application layerB.internet layer —network interface layer—transport layer—application layerC.network interface layer—transport layer —network interface layer—application layerD.application layer—transport layer —internet layer—network interface layer
用Protel设计电子产品，需要设计人员首先确定其电路板的尺寸，因此首要的工作就是电路板的规划，通常在哪一个板层上来确定板得电气尺寸？（）A、MechanicalLayerB、TopLayerC、BottomLayerD、KeepOutLayer
在Protel设计中，由于针脚式元件封状的焊盘和过孔贯穿整个线路板，所以在焊盘的属性对话框中，PCB板的层属性必须为（）。A、Multi layerB、Top OverlayerC、TopLayerD、Bottom Layer
Which layer in the TCP/IP model is responsible for delivering packets to their destination?（）A、Application LayerB、Transport LayerC、Internet LayerD、Network Access Layer
What layer of the TMN （telecommunications management network） model does CTM fit into？（）A、Network management layerB、Element management layerC、Business management layerD、Network element layer
While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."At which OSI layer is this problem associated with?（）A、The data link layerB、The application layerC、The access layerD、The session layerE、The network layer
电路板的（）层主要用于绘制元器件外形轮廓以及标识元器件标号等，该类层共有两层。A、Keep-Out LayerB、Silkscreen LayersC、Mechanical LayersD、Multi-Layer
Which layer in the OSI model is responsible for translating frames into bits?（）A、Application LayerB、Presentation LayerC、Data Link LayerD、Physical Layer
单选题PCB设计中电路板的标注尺寸、边框等信息所用工作层是（）ATopLayer顶层BMechanical layer机械层CSilkscreen丝印层DBottomLayer底层