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【单选题】
如图所示电路中,输入输出电压均为直流电压,该电路引入了何种反馈?A.
无反馈
B.
正反馈
C.
负反馈
D.
以上均有可能
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【单选题】He was not ready to believe something just _ aristotle said so.
A.
because
B.
for
C.
that
D.
this
【简答题】He was not ready to believe something just because the ancients said so.
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