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道路交通标志分为（）两大类。主标志又分为：警告标志、禁令标志、指示标志、指路标志、旅游区标志和道路施工安全标志。
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【简答题】Artists write songs as an expression of themselves. Some choose to let the music do the talking, but most of them also use lyrics to convey emotion. Understanding lyrics is not always easy, the corre...
【简答题】Using Boolean notation, write an expression that is a 1 whenever one or more of its variables (A,B,C,and D) are 1s
【单选题】Using DeMorgan’s Law, write an expression for the complement of F if F(x,y,z) = xy + xz + yz. The correct one is:
A.
(x + y)(x + z)(x' + z)
B.
(x' + y')(y'+ z)(x' + z)
C.
(x' + y')(y'+ z')(x' + z)
D.
(x' + y')(y'+ z')(x' + z')
【简答题】国际多式联运经营人的责任形式有__、__、__。
【简答题】write an expression that is a 1 only if all of its variables (A,B,C,and D) are 1s
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