【简答题】用3线-8线译码器74138分别设计出完成下述BCD码制转换的电路: ①8421码→余3码; ②5421码→8421码;
【简答题】译码是编码的 过程,是将给定的二进制代码翻译成编码时赋予的 。完成这种功能的电路称为 。译码器是 输入端, 输出端的组合逻辑电路。
【判断题】(判断题)西方人庆贺胜利常用的“V”形手势,应注意把手心对着观众。( )
【单选题】“Upwardly mobile society” refers to a society where _______.
A.
people like to move from one place to another
B.
people like to move in their automobiles
C.
parents hope their children to get higher positions in society
【单选题】What does the author think of society toward motorists?
A.
Society smiles on the motorists.
B.
Huge car parks are built in cities and towns.
C.
Victims of accidents are nothing.
D.
Society' condones their rude driving.
【判断题】能够完成译码工作的器件称为译码器,它是一种多输入、多输出的组合逻辑电路。
【简答题】基本译码器电路除了完成译码功能外,还能实现 和 多路分配 功能。
【简答题】用3线-8线译码器741 38分别设计出完成下述BCD码制转换的电路: ①8421码→余3码; ②格雷码→8421码; ③5421码→842l码; ④余3码→542l码。