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【简答题】
如图所示,已知 U CC = 12 V, R c = 3kΩ , R b1 = 20kΩ , R b2 = 10kΩ, R L = 3kΩ, R e = 2kΩ, β= 40 , rbe=1kΩ , Rs=1kΩ 求( 1 )静态工作点 ( 2 )有负载电阻 RL 的情况下,输出电压对输入信号源的电压放大倍数 Auls (3) 求输入电阻、输出电阻
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反馈参考答案：
举一反三
【单选题】当二阶系统的阻尼比【图片】在0<【图片】
A.
一对实部为负的共轭复根
B.
一对实部为正的共轭复根
C.
一对共轭虚根
D.
一对负的等根
【单选题】Nowadays teens prefer going to the cybercafé ，_____ ,as is known to us, they can chat with their friends by QQ or play games.
A.
which
B.
where
C.
that
D.
when
【简答题】足球的起源于哪里?
【单选题】What does the story intend to tell us?
A.
Little people can make a big difference
B.
A friend in need is a friend indeed
C.
East or West,home is best
D.
Technology is power
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