2选1的数据选择器　　实现2选1的电路功能，其真值表和电路符号如下图所示。即当s＝1时，输出m＝y；当s＝0时，输出m＝x。 -2 Select a data selector circuit to achieve 2 S 1 function, its truth table and circuit symbols shown below. That is, when s = 1, the output m = y　when s = 0, the output m = x.