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【单选题】
若某离散时间LTI系统的单位脉冲响应h[k]=u[k]-u[k-2],则该系统的单位阶跃响应g[k]为( )
A.
u[k]+u[k-2]+u[k-1]
B.
u[k]-u[k-1]
C.
u[k]+u[k-1]
D.
r[k]-r[k-2]
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