【单选题】【消耗次数：1】
判断集成电路的功能应根据以下_______。①整机电路图中的信号输入输出关系②集成电路的数据资料③外形④型号
①
①③④
②
②③④
③
①②④
④
①②③④
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检测集成电路是否损坏可采用以下方法_______。①在工作状态检测集成电路的输入和输出信号（电压）波形②在工作状态检测电源供电电压③在断电状态检测各引脚对地电阻④在工作状态检测各引脚的工作电压
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