题目内容
(请给出正确答案)
[单选题]
某事故树的最小径集为:Pl={Xl,X2,X4},P2={Xl,X2,X5},P3={Xl,X3,X7},则结构重要程度为()。
A.I(1)>I(2)=I(3)>I(4)=I(5)
B.I(1)>I(2)I(4)=I(5)
C.I(1)>I(2)>I(3)
D.I(3)>I(2)I(4)=I(5)
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A.I(1)>I(2)=I(3)>I(4)=I(5)
B.I(1)>I(2)I(4)=I(5)
C.I(1)>I(2)>I(3)
D.I(3)>I(2)I(4)=I(5)
A.0.25X1-0.25X2+0.25X3-0.25X4
B.0.3X1-0.3X2+0.3X3-0.3X4
C.0.25X1+0.25X2+0.25X3+0.25X4
D.0.3X1+0.3X2+0.3X3+0.3X4
已知某采样系统的输入输出差分方程为
试求该系统的脉冲传递函数X1(z)/X2(z)和脉冲响应。