____反馈主要用于振荡等电路中,____反馈主要用于改善放大电路的性能。
查看答案
若放大电路的A小于零,则接入的反馈一定是负反馈;若放大电路A的大于零,则接入的反馈一定是正反馈。
A. 对
B. 错
The ______ opened the meeting by greeting the visitor from China.
A. participant
B. apprentice
C. chairwoman
D. secretary
The ______ was distributed to the participants ten days before the meeting.
A. agenda
B. minutes
C. menu
D. summary