放大电路及参数如题51所示,则其输出电阻[img=39x22]1803a98a90a3817.png[/img]
A: [img=32x19]1803a98aa941f22.png[/img]
B: [img=32x19]1803a98ab26d026.png[/img]
C: [img=32x19]1803a98abc13099.png[/img]
D: [img=32x19]1803a98ac45f025.png[/img]
A: [img=32x19]1803a98aa941f22.png[/img]
B: [img=32x19]1803a98ab26d026.png[/img]
C: [img=32x19]1803a98abc13099.png[/img]
D: [img=32x19]1803a98ac45f025.png[/img]
举一反三
- 一个多级放大电路由2个单管放大器构成,第一级放大电路的电压放大倍数为-50,输入电阻为[img=41x19]1803b4c4f23aecc.png[/img],输出电阻为[img=32x19]1803b4c4fa402da.png[/img];第二级放大电路的电压放大倍数为80,输入电阻为[img=32x19]1803b4c502f1f49.png[/img],输出电阻为[img=32x19]1803b4c50aa3e8f.png[/img];则多级放大电路的电压放大倍数、输入电阻、输出电阻各为________。 A: 30,[img=41x19]1803b4c512ebfdd.png[/img],[img=32x19]1803b4c51ae473f.png[/img] B: 80,[img=32x19]1803b4c5238e27f.png[/img],[img=32x19]1803b4c51ae473f.png[/img] C: -4000,[img=41x19]1803b4c512ebfdd.png[/img],[img=32x19]1803b4c51ae473f.png[/img] D: -4000,[img=32x19]1803b4c5238e27f.png[/img],[img=32x19]1803b4c54a18290.png[/img]
- 放大电路及参数如题51所示,则其从电容C1右侧看过去的输入电阻[img=37x22]1803a98a605a520.png[/img]___________________ A: [img=50x19]1803a98a68cdc66.png[/img] B: [img=50x19]1803a98a7028603.png[/img] C: [img=50x19]1803a98a795fb42.png[/img] D: [img=32x19]1803a98a81d0ad1.png[/img]
- 设[img=162x19]17e0ab913cc7ca8.jpg[/img]且X,Y相互独立,则[img=84x19]17e0ab9147a14b0.jpg[/img]. A: 14 B: 22 C: 32 D: 40
- 设函数[img=39x20]18034b170c45af6.jpg[/img],则曲线的拐点 A: [img=32x19]18034b1714beef8.jpg[/img] B: [img=33x17]18034b171d8b944.jpg[/img] C: [img=32x19]18034b17259f81d.jpg[/img] D: [img=34x14]18034b172def130.jpg[/img]
- 设函数[img=39x20]18034b1025f5fa2.jpg[/img],则曲线的拐点 A: [img=34x14]18034b102de265a.jpg[/img] B: [img=32x19]18034b10361e70e.jpg[/img] C: [img=33x17]18034b103dfc589.jpg[/img] D: [img=32x19]18034b1045a4422.jpg[/img]