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【简答题】
n 变量的逻辑函数有 个最小项,任意两个最小项的乘积为 。 逻辑函数 F ( A , B , C )= Σ m (0 , 1 , 4 , 6) 的最简 与非 - 与非 式为 。 异或函数与同或函数在逻辑上互为反函数。( )。 因为逻辑表达式 A+B+AB=A+B成立,所以AB=0成立。( ) 若两个函数具有不同的逻辑函数式,则两个逻辑函数必然不相等。( ) 若两个函数具有不同的真值表,则两个逻辑函数必然不相等。( ) 逻辑函数两次求反则还原,逻辑函数的对偶式再作对偶变换也还原为它本身。( )
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【单选题】According to the conversation which statement about the name of the White House is True?
A.
It became official before President Theodore Roosevelt had it engraved upon his stationery.
B.
It derives the name from the color of the building.
C.
The building was restored after being burned in 1814, so the smoke - stained gray stone walls were painted white.
D.
Actually the cognomen 'White House' was applied to the building some time before it was painte
【单选题】一 Have you moved to your new house? 一 Not yet. My house _____. [ ]
A.
is painting
B.
has been painted
C.
is painted
D.
is being painted
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A.
Can
B.
Would
C.
Could
D.
Will
【简答题】液压系统的油温较高或环境温度较高，宜选用（）的液压油。
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