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关联词填空,有两空的题目答案之间用逗号隔开,如:a,b 1. Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _____it was poorly equipped. 2. The shopkeeper did not want to sell the products for ______ he thought was not enough. 3. We really want to know _____ use can be made of this material. 4. After the discussion, there was still some doubt _______fingerprints had been left on the safe. 5. _______makes mistakes must correct them. 6. He asked us _________ we were getting along with our work. 7. This is _____you spent your summer holiday, isn’t it? 8. Sometimes we are asked _______ we think the likely result of an action will be. 9. ______ they won the game was ______ we had expected. 10. The poor young man is ready to accept ________ help he can get.
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【简答题】放大电路如图所示,已知Rb1=10kΩ,Rb2=51kΩ,Rc=3kΩ,Re=500Ω,Ucc=12V,β=30,试求: (1)静态工作点ICQ和UCEQ。 (放大电路如图所示, 已知RB1=60kΩ,RB2=20kΩ,RC=3kΩ,RE=2kΩ,RL=6kΩ,UCC=16V,三极管电流放大系数β=60. (1)求静态工作点; (2)求输入电阻Ri、输出电阻Ro和电压放大倍数Au;
【单选题】放大电路如图2.10所示,已知:R B =240kfΩ,R C =3kΩ,晶体管β=20,U CC =12V。现该电路中的三极管损坏,换上一个β=40的新管子,若要保持原来的静态电流I C 不变,且忽略U BE ,应把R B 调整为(    )。
A.
480kΩ    
B.
240kΩ    
C.
120kΩ
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ,RB2=10kΩ,RC=RE= 2kΩ,RL=3kΩ,UCC=20V,三极管的电流放大系数β=60,计算电压放大倍数。【图片】
【简答题】分压式偏置共射极放大电路如下图所示。已知RB1=30kΩ,RB2=10kΩ,RC=RE= 2kΩ,RL=3kΩ,UCC=20V,三极管的电流放大系数β=60,输入电阻为( )KΩ,输出电阻为( )KΩ。【图片】
【简答题】如图15-44所示电路,已知U CC =20V,R B =120kΩ,R E =R L =3.6kΩ,β=100,静态时U CE =5.5V,R S =3kΩ(1)试求r i ,A u ,r o ;(2)若R S =300Ω,求输出电阻r o ;(3)若R S =30kΩ,求r 0 ;(4)将(1),(2),(3)的计算结果作比较,说明射极输出器特点。
【单选题】下列选项中的句子,与例句“句读之不知,惑之不解”句式特点相同的一项是
A.
师者,所以传道受业解惑也
B.
不拘于时,学于余
C.
大王来何操?
D.
蚓无爪牙之利,筋骨之强
【简答题】放大电路如图2-17(a)所示。已知:β=20,R b =200Ω,U CC =20V,R b1 =R b2 =24kΩ,R c =1kΩ,U BE =0.7V,r bb' =200Ω。VDZ为理想的硅稳压二极管,其稳压值U DZ =6V。 (1) 求静态工作点的I CQ 和U CEQ ; (2) 求电压放大倍数A u 和输入电阻R i ; (3) 若VDZ极性接反,电路能否正常放大?试计算此时的...
【简答题】项目组通过仿生研究,发现土壤动物具有巧妙的()现象。
【单选题】晶体管非门电路如图所示,已知UCC=15V,UB=-9V, RC=3kΩ,RB=20kΩ,β=40,当输入电压U1=5V时,要使晶体管饱和导通,Rx值不得大于( )kΩ。(设UBE =0.7V,集电极和发射极之间的饱和电压UCES=0.3V)
A.
7.1
B.
35
C.
3.55
D.
17.5
【单选题】晶体管非门电路如图所示,已知Ucc=15V,UB=-9V,Rc=3kΩ,RB=20kΩ,β=40当输入电压U1=5V时,要使晶体管饱和导通,Rx值不得大于:(设UBE=0.7V,集电极和发射极之问的饱和电压Uces=0.3V)
A.
7.1kΩ
B.
35kΩ
C.
3.55kΩ
D.
17.5kΩ
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