單項(xiàng)選擇題

請(qǐng)根據(jù)下面方塊圖寫出傳遞函數(shù)式,正確的表達(dá)式是()。

A、G(S)=G1(S)X1(S)+G2(S)X2(S)+G3(S)X3(S)
B、G(S)=G1(S)X1(S)G2(S)X2(S)G3(S)X3(S)
C、G(S)=G1(S)+G2(S)+G3(S)
D、G(S)=G1(S)G2(S)G3(S)X3(S)

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