大学MOOC 数字逻辑电路(中国计量大学)1461039166 最新慕课完整章节测试答案

test3

1、单选题：
‌1.The Boolean expression A + B + C is‎
选项：
A: a sum term  
B: a literal term
C: an inverse term 
D: a product term
答案: 【 a sum term  】

2、单选题：
‎2.Which one of the following is not a valid rule of Boolean algebra?​
选项：
A: A + 1 = 1
B:
C: AA = A 
D: A + 0 = A
答案: 【 】

3、单选题：
‌3.According to DeMorgan’s theorems, the complement of a product of variables is equal to‍‌‍‌‍
选项：
A: the complement of the sum
B: the sum of the complements
C:  the product of the complements
D: answers (a), (