【多选题】移动端网站优化和 PC 端网站优化的区别有( )
【简答题】主轴变频控制过程中出现“主轴电动机不能运行的故障”。简述其故障原因
【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】write an expression that is a 1 only if all of its variables (A,B,C,and D) are 1s