5. 承上題,電路改用雙埠網路的混合參數表示,則 \( h_{21} \) 及 \( h_{22} \) 之值為何?
(A) \( h_{21} = -\frac{3}{4} \),\( h_{22} = \frac{1}{8}\text{S} \)
(B) \( h_{21} = -\frac{1}{4} \),\( h_{22} = \frac{1}{16}\text{S} \)
(C) \( h_{21} = -\frac{1}{2} \),\( h_{22} = \frac{1}{12}\text{S} \)
(D) \( h_{21} = -\frac{1}{8} \),\( h_{22} = \frac{1}{32}\text{S} \)

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