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【单选题】
已知某放大电路在输入信号电压为1mV时，输出电压为1V；当加上负反馈后达到同样的输出电压时需加入输入信号为10mV。以下描述错误的是（）。A.
反馈深度 为20
B.
反馈系数为 0.009
C.
开环增益为6 0dB
D.
闭 开环增益为4 0dB
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反馈参考答案：
举一反三
【单选题】听力原文： If you are a college student, there are several things you should know about renting an apartment. First, you must know how to look for a place to live. Friends, teachers, and other people you m...
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】听力原文：If you are a college student, there are several things you should know about renting an apartment. First, you must know how to look for a place to live. Friends, teachers, and other people you me...
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】听力原文： If you are a college student, there are several things you should know about renting an apartment. First, you must know how to look for a place to live: Friends, teachers, and other people you m...
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】我国的安全生产方针、安全生产客观规律的具体要求是指( )。
A.
“安全第一，预防为主”
B.
“安全第一，预防为主，综合治理”
C.
“管生产的同时必须管安全”
D.
“安全第一，以人为本”
【判断题】There are one student and two teachers in the classroom. 请判断这句话的对错。A. 对 B. 错
A.
正确
B.
错误
【单选题】听力原文： If you are a college student, there are several things you should know about renting an apartment. First, you must know how to look for a place to live. Friends, teachers, and other people you m...
A.
Two.
B.
Three.
C.
Four.
D.
Five.
【单选题】We are ensured that there are enough textbooks for each student to have _______ when the new semester comes.
A.
it
B.
those
C.
one
D.
them
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