单项选择题
A.Shape B.HoleSize C.Designator D.Layer
A.ERC B.PCB C.DRC D.PLD
A.MiscellaneousDevice.Lib B.MiscellaneousConnectors.InLib C.SimulationSources.IntLib D.FPGAInstru()。ments.IntLib
A.低电平有效 B.集电极输出 C.时钟信号输入 D.脉冲信号输入
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