利用4选1实现F(x,y,z)=xz+yz’。(未知)
利用4选1实现F(x,y,z)=xz+yz’。(未知)
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执行下面代码,错误的是 def f(x, y = 0, z = 0): pass # 空语句,定义空函数体A.f(1, z = 3)B.f(z = 3, x = 1, y = 2)C.f(1, x = 1, z = 3)D.f(1, y = 2, z = 3)
执行下面代码,错误的调用是() def f(x, y = 0, z = 0): pass # 空语句,定义空函数体A.f(1, x = 1, z = 3)B.f(1, y = 2, z = 3)C.f(1, z = 3)D.f(z = 3, x = 1, y = 2)
int x=3,y=4,z=5;则值为0的表达式是A.x!=y+z>y-zB.x<=y+1C.y%z>=y-zD.x>yE.(xy)==(x||z)F.!(x>y)+(x!=z)||(x+y)(y-z)
已知表达式P[x, f(y), B]的两个置换为:s1={z/x, w/y},s2={q(z)/x, A/y},则以下选项正确的是()A.P[x,f(y),B]s1= P[z/x,f(w/y),B]B.P[x,f(y),B]s2= P[q(z),A,B]C.P[x,f(y),B]s1= P[z,f(w),B]D.P[x,f(y),B]s2= P[q(z),f(A),B]
执行下面的代码,运行正确的是(). def f(x, y = 0, z = 0): passA.f(1 , x = 1 , z = 3 )B.(x = 1, 2)C.f(x = 1, y = 2, z = 3)D.f(1 , y = 2 , z = 3)
1、执行下面的代码,运行正确的是(). def f(x, y = 0, z = 0): passA.f(1 , x = 1 , z = 3 )B.(x = 1, 2)C.f(x = 1, y = 2, z = 3)D.f(1 , y = 2 , z = 3)
4、设有关系模式R(U , F),其中U={X,Y,Z},F={X→Z,Y→Z },则属于主属性的是A.X、Y和ZB.Y和ZC.X和YD.X和Z