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【单选题】
放大电路中有反馈的含义是( )A.
输出与输入之间有信号通路
B.
输出与输入信号成非线性关系
C.
电路中存在反向传输的信号通路
D.
除放大电路以外没有信号通路
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举一反三
【简答题】In order to find a proper environment to foster her child, Mencius’s mother .
【单选题】Mrs. Armstead’s young grandchildren faced foster care when their mother_______.
A.
died
B.
abandoned them
C.
was addicted to drugs
D.
suffered from a terrible disease
【简答题】The foster mother cared for those boys as (faith) _________ as if they have been her own sons.
【简答题】To become a foster parent, one needs to undergo, through a foster agency, the process of ________.
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