对于对称二端口网络，其短路导纳参数矩阵参数具有如下特征（ ）

A . 对称 B . 不对称 C . 相等 D . 不确定

A . 1 B . 2 C . 3 D . 4

A . 正确 B . 错误

A .https://assets.asklib.com/psource/2015102715442257377.jpg B .https://assets.asklib.com/psource/2015102715442535355.jpg C .https://assets.asklib.com/psource/2015102715442726007.jpg D .https://assets.asklib.com/psource/2015102715443096508.jpg

若题图所示电路中二端口网络的A参数已知，则11&39;端口的输入电阻Z_in=______。 <img src='https://img2.soutiyun.com/ask/5499001-5502000/7cc3154445ed13f2c39a3500448c50d8.jpg' />

图示电路中，N为含源线性电阻网络，其端口伏安特性曲线如图(b)所示，其戴维南等效电路参数为()。 A．Uoc=-12V，R0=-3Ω B．Uoc=-12V，R0=3Ω C．Uoc=12V，R0=3Ω D．Uoc=12V，R0=-3Ω <img src='https://img2.soutiyun.com/ask/uploadfile/2766001-2769000/efeb2fb9e7ac950f1ab146ca4df3e402.jpg' />

A．<img src='https://img2.soutiyun.com/shangxueba/ask/18087001-18090000/18087885/2015102715442257377.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/18087001-18090000/18087885/2015102715442535355.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/18087001-18090000/18087885/2015102715442726007.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/18087001-18090000/18087885/2015102715443096508.jpg' />

<img src='https://img2.soutiyun.com/ask/2020-11-30/975598574613914.png' /><img src='https://img2.soutiyun.com/ask/2020-11-30/975598687906394.png' />

A.<img src="https://img.ppkao.com/STUploads/2022/10/12/Images/d82a4bf9f238479f9bea1347104995fc.png"/> B.<img src="https://img.ppkao.com/STUploads/2022/10/12/Images/2bf03a24b6cb403f8555d8720f8aba0e.png"/> C.<img src="https://img.ppkao.com/STUploads/2022/10/12/Images/93d32c1d626b4e6ba351768094ea21c2.png"/> D.<img src="https://img.ppkao.com/STUploads/2022/10/12/Images/60a1434d8d734f00a405106253fc9623.png"/>

A．内部结构和元件参数 B．工作频率 C．元件参数和工作频率

A．1 B．2 C．3

A．T=T1+T2 B．T=T1*T2 C．Z=Z1+Z2 D．Y=Y1+Y2

A．n 阶 B．n-1 阶 C．n+l 阶 D．n一2 阶

<img src='https://img2.soutiyun.com/ask/2020-05-29/959607924293353.png' />

试证明题7.7图所示的二端口网络的y参数矩阵为<img src='https://img2.soutiyun.com/ask/2020-09-17/969202367588149.png' /> 证明将题7.7图复杂的二端口网络视为如题解7.7图中两个子二端口网络的并联。 <img src='https://img2.soutiyun.com/ask/2020-09-17/969202379630838.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-11/971301302239894.jpg' />

<img src='https://img2.soutiyun.com/shangxueba/ask/2022-03/10/779/20220310134450123.png' />