A、1
B、2
C、6
D、4
更多“ 如图运放构成的运算电路，R<sub>1</sub>=2kΩ，R<sub>2</sub>=R<sub>1</sub>∥R<sub>F</sub>。当U<sub>i</sub>=3V时，U<sub>0</sub>=-9V，则R<sub>F</sub>=（）kΩ。<img src="https://nimg.ppkao.com/2018-09/wangjing/2018090615362710482.jpg?sign=ac1c6eccb987586b39275b4f6898577d&t=62d25299" />”相关的问题
A、如题68图所示电路，运算放大器为理想运算放大器，已知U<sub>i1sub>=2V，U<sub>i2sub>=4V，R<sub>1sub>=194;R<sub>5sub>=10kΩ，R<sub>2sub>=20194;kΩ，R<sub>3sub>=194;R<sub>4sub>=5194;kΩ。求：rc="https://img.ppkao.com/2018-09/tianmin/2018090510023683894.jpg" />
A、如题68图所示电路，运算放大器为理想运算放大器，已知U<sub>i1sub>=2V，U<sub>i2sub>=4V，R<sub>1sub>=194;R<sub>5sub>=10kΩ，R<sub>2sub>=20194;kΩ，R<sub>3sub>=194;R<sub>4sub>=5194;kΩ。求：rc="https://img.ppkao.com/2018-09/tianmin/2018090510023683894.jpg" />
A、电路如图T6．5所示，试回答下列问题：rc="https://img.ppkao.com/2018-08/yuanhao/2018082714051018808.jpg" />
A、如图所示为电桥电路，已知R<sub>1sub>=1Ω、R<sub>2sub>=2Ω、R<sub>3sub>=2Ω、R<sub>4sub>=4Ω、R<sub>5sub>=5Ω，试求等效电阻R<sub>absub>。rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、已知电路如图所示，其中E<sub>1sub>=15V，E<sub>2sub>=65V，R<sub>1sub>=5Ω，R<sub>2sub>=R<sub>3sub>=10Ω。试用支路电流法求R<sub>1sub>、R<sub>2sub>和R<sub>3sub>三个电阻上的电压。rc="https://img.ppkao.com/2018-09/tangxueping/2018092817031193342.jpg" />
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