一个正弦波振荡器的开环电压放大倍数为A,反馈系数为F,能够稳定振荡的幅值条件是()。
A.|AF|>1
B.|AF|<1
C.|AF|=1
D.|AF|=0
参考答案:C
It was wrong of you to from all your friends who helped you when you were in trouble.
A.break away
B.break down
C.break into
D.break out
德国法西斯迫害犹太人的根本原因是
A.夺取犹太人的财富
B.煽动种族狂热,为侵略制造借口
C.犹太人中进步人士很多
D.犹太人颠覆 * *