如下图所示，闭环离散系统的输出C(z)=[img=329x123]17da5aebe5ac56b.png[/img]
A: (GR(z))/(1+GH(z))
B: (G(z)R(z))/(1+GH(z))
C: (GR(z))/(1+G（z）H(z))
D: (G（z）R(z))/(1+G（z）H(z))
A: (GR(z))/(1+GH(z))
B: (G(z)R(z))/(1+GH(z))
C: (GR(z))/(1+G（z）H(z))
D: (G（z）R(z))/(1+G（z）H(z))
举一反三
- 已知()x()(()n())()的()z()变换是()X()(()z())(),()ROC()是()|()z()|()>()a(),则()x(()-()n()-()5())()的()z()变换和()ROC()是()()A.()()z()-()5()X()(1/()z()),z()>()1/()a()B.()()z()5()X()(1/()z()),z()>()1/()a()C.()()z()-()5()X()(1/()z()),z()<()1/()a()D.()()z()5()X()(1/()z()),z()<()1/()a
- 已知g= lambda x, y=3, z=5: x*y*z, 则语句print(g(1, z=2))的输出结果为 ( ) A: 5 B: 6 C: 3 D: 1
- 已知序列[img=256x24]1803c8ed65826a9.png[/img] A: X(z)=2/(Z*n0) 0|Z|1 B: X(z)=3/(Z*n0) 0|Z|10 C: X(z)=1/(Z*n0) 0|Z|[img=18x14]1803c8ed6ec7788.png[/img] D: X(z)=Z*n0 0|Z|[img=18x14]1803c8ed6ec7788.png[/img]
- 公式"x ( F(x,y,z ) → "y ( G(x,y,z) → "z H(x,y,z) ) )的前束范式为 A: "x$y$z (F(x,t,w) → ( G(x,y,w ) → H(x,y,z) ) ) B: $x$y$z (F(x,t,w) → ( G(x,y,w ) → H(x,y,z) ) ) C: "x"y$z (F(x,t,w) → ( G(x,y,w ) → H(x,y,z) ) ) D: "x$y"z (F(x,t,w) → ( G(x,y,w ) → H(x,y,z) ) )
- 【简答题】指出下列关系模式是第几范式?并说明理由。 1 R (X,Y,Z) F={XY →Z} 1 R (X,Y,Z) F={Y →Z,XZ→Y} 1 R (X,Y,Z) F={Y →Z,Y→X,X→Y , X→ Z} 1 R (X,Y,Z) F={X →Y,X→Z} 1 R (W,X,Y,Z) F={X →Z,WX→Y}