A、用3线-8线译码器74HC138和门电路产生如下函数。用8选1数据选择器74HC151实现函数Y2。
c="https://img.ppkao.com/2018-10/luoyueping/2018101416365173172.jpg" />
A、用3线-8线译码器74HC138和门电路产生如下函数。用8选1数据选择器74HC151实现函数Y2。
c="https://img.ppkao.com/2018-10/luoyueping/2018101416365173172.jpg" />
A、74LS244/74HC244是单向,74LS245/74HC245是双向 B、74LS244/74HC244是双向,74LS245/74HC245是单向 C、74LS244/74HC244不是单向,74LS245/74HC245不是双向 D、74LS244/74HC244和74LS245/74HC245均是双向无区别
A、bottom contour only up to depths of 100 fathoms B、depth underneath the keel against a time base C、contour of the bottom against a distance base D、depth of water against a distance base