题目内容
(请给出正确答案)
[单选题]
以下环节中可作滞后-超前环节的是()。
A.Gc(s)=1/(s+1)
B.Gc(s)=(s+2)/(s+1)
C.Gc(s)=(s+1)/(s+2)
D.(s)=[(s+1)/(s+2)]*[(0.3s+1)/(3s+1)]
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A.Gc(s)=1/(s+1)
B.Gc(s)=(s+2)/(s+1)
C.Gc(s)=(s+1)/(s+2)
D.(s)=[(s+1)/(s+2)]*[(0.3s+1)/(3s+1)]
A.Gc(s)=(2s+1)/(s+1)
B.Gc(s)=3*[(2s+1)/(3s+1)]
C.Gc(s)=(s+1)/(2s+1)
D.Gc(s)=3*[(s+1)/(2s+1)]