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【简答题】
如图2.7(a)所示。已知:U DD =-24V,R G1 =90kΩ,R G2 =25kΩ,R G3 =1MΩ,R D =R S =10kΩ,场效应管的I DSS =-2mA,U GS(off) =5V;电容 C 1 ,C 2 ,C 3 的值均足够大,对交流信号可以视作短路,信号源的内阻只R g =100kΩ。试求: (1) 从漏极输出时的电压放大倍数 及输出电阻r o1 值; (2) 从源极输出时的电压放大倍数 及输出电阻r d2 值; (3) 输入电阻r i 值。
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举一反三
【单选题】系统原因主要指 () 自身故障。
A.
基础设备
B.
系统设备
C.
车站设备
D.
控制设备
【单选题】如创伤病人的血量达到( ) 以上,就可能引起休克
A.
30%
B.
35%
C.
40%
D.
45%
【单选题】While teaching, we should keep our clas running smoothly and
A.
thoroughly
B.
efficiently
C.
speedily
D.
directly
【简答题】First, while language provides a means of saying and doing things, teaching is generally being divorced from the use we make of language.【M1】______ We teach an unapplied system, rather than teach stud...
【单选题】网上订价发行申购期内,投资者按委托人买入股票的方式,以发行价格填写委托单,认购完成前可以撤单。 ( )
A.
正确
B.
错误
【单选题】关于多轴使用的无刷电机与有刷电机,说法正确的是[1分]
A.
有刷电机驱动交流电机
B.
无刷电机驱动交流电机
C.
无刷电机驱动直流电机
【单选题】系统原因主要指 (B )自身故障。
A.
基础设备
B.
系统设备
C.
车站设备
D.
控制设备
【判断题】网上订价发行申购期内,投资者按委托人买入股票的方式,以发行价格填写委托单,认购完成前可以撤单。 ( )
A.
正确
B.
错误
【单选题】While teaching a strategy,_______
A.
a teacher should offer the strategy to the students and provide a lengthy demonstration.
B.
a teacher should offer the strategy to the students and give a brief explanation, example or a demonstration.
C.
students cannot get start without knowing the strategy clearly.
D.
a teacher would make a decision about how much support to provide and provide support through prompts, coaching and feedback.
【单选题】While teaching, we should keep our class running smoothly and ___________.
A.
thoroughly
B.
efficiently
C.
speedily
D.
directly
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