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搜题
【单选题】
One of his teachers ventured their opinion and suggested to his mother that Al had an "addled" brain.
A.
befuddled
B.
brilliant
C.
somber
D.
abnormal
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A.
正确
B.
错误
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A.
监管局 网上商家消费者 CA认证机构
B.
网上商家
C.
消费者
D.
CA中心
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【判断题】假设A、B均为逻辑变量, 若A=B,则A+B=A。【hgt2020021104-0006】
A.
正确
B.
错误
【单选题】设逻辑变量X为True,Y、Z均为False,以下逻辑表达式值为True的是______
A.
X  or  (Y and Z)
B.
(X and Y) or Z
C.
(not X) or Y or Z
D.
X and (Y or Z)
【判断题】假设A、B、C均为逻辑变量, 若AB=AC,则B=C。【hgt2020021102-0004】
A.
正确
B.
错误
【判断题】假设A、B、C均为逻辑变量,则: 【sxj2020020902-0002】
A.
正确
B.
错误
【单选题】在B2C电子商务模式中,参与主体不包含( )
A.
监管局
B.
网上商家
C.
消费者
D.
CA认证机构
【单选题】设逻辑变量X为False,Y、Z均为True,以下逻辑表达式值为False的是______。
A.
X or (Y and Z)
B.
(X and Y) or Z
C.
(not X) or Y or Z
D.
X and (Y or Z)
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