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??????????(2). ????????????????????????????[?]???: U1(s) = U(s) Y2(s), U2(s) = Y1(s) Y3(s), U3(s) = Y2(s), Y(s) = Y3(s), Y1(s) = G1(s)U1(s), Y2(s) = G2(s)U2(s), Y3(s) = G3(s)U3(s)U1(s), U2(s), U3(s), Y1(s), Y2(s), Y3(s) ????Y (s) = G3(s)G2(s)(G1(s)(U (s) G3(s)1Y (s)) Y (s)). G1(s).
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