A.普通B.大纲C.Web 版式D.页面
A.sum(C2:C80)B.average(C2:C80)C.max(C2:C80)D.min(C2:C80)
A.发送数字信号B.接收数字信号C.实现数字信号与模拟信号之间的相互转换D.进行电信号匹配