如图所示电路，端口的输入电阻为（）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/d98ab65818b047beb7603a190135ae10.png
举一反三
- 电路如图 4 所示，电流 I 为 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/48dcfd6292e44a329c2d5b04973679d8.png
- 电路如图5所示，运算放大器构成 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/ad0dc8cc2e8547ccb31a035a818c1d8d.png
- 电路如图所示，则含源一端口的戴维宁等效电阻为（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/f7b1c117013a4796be2d662d0c0f5a31.png
- 已知电路如图 4 所示，运算放大器构成http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/0547d1e3e7b44b5d8201447c92ed6e29.png
- 如图所示电路的等效电阻Rab=2Ω。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/d2872874ac4a4a29a10bd8dbf3a8d2d7.png