A.K /[ω(Tω+1)]B.K / (Tω+1)C.K / (ω(T 2 ω 2 +1))D.K / (ω(T 2 ω 2 +1) 0.5 )
A、0.5A(0)B、0.707A(0)C、A(0)D、0