【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
【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。