问答题

正弦波振荡电路振荡频率主要决定于

答案： A.选频网络
B.放大电路
C.反馈网络
正确答案：选频网络

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One of the best ways to start the discussion section is to start with the study’s major findings that provide an answer to the research question in the Introduction.

答案：正确

正弦波振荡电路产生振荡的平衡条件为

答案： A.AF=1
B.AF<1
C.AF=-1
D.AF>1
正确答案：AF=1