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【单选题】
已知某负反馈放大电路的框图如题 9 图所示,已知某开环电压放大倍数为 A u =2000 ,反馈系数 F u =0.0495 ,若输出电压 u o =2V ,则该电路的净输入电压 u i 及闭环电压放大倍数 A uf 分别为A.
10 mV ， 20
B.
1 mV ， 200
C.
1 mV ， 20
D.
10 mV ， 200
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反馈参考答案：
举一反三
【单选题】以下4组用户标识符中,全部合法的一组是( )
A.
_main enclude sun
B.
If -max turbo
C.
txt REAL 3COM
D.
int k_2 _001
【简答题】The amount of CO2 produced when the organic carbon in the sample is oxidized by a strong oxidizer and comparing it with the amount in a standard of known TOC.
【单选题】The passage suggests that a large decrease in the amount of CO2 in the atmosphere would result in ______.
A.
at least a slight decrease in global temperatures
B.
at most a slight increase in short wavelength radiation reaching the Earth
C.
a slight long-term increase in global temperatures
D.
a slight short-term increase in global temperatures
【简答题】The amount of CO2 released [ ] has to be reduced by more than 10% to make a difference.
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