【判断题】【消耗次数:1】
为了提高三极管放大电路输入电阻采用串联负反馈。
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相关题目
【判断题】 为了稳定三极管放大电路的静态工作点,采用串联负反馈。
①  正确
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【判断题】 为了稳定三极管放大电路静态工作点,采用交流负反馈。
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【判断题】 为了稳定三极管放大电路的交流输出电流采用电压并联负反馈。
①  正确
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【单选题】 放大电路引入电压串联负反馈,其输入电阻
①  增大
②  减小
③  不变
④  不一定
【单选题】 放大电路引入电压串联负反馈,其输入电阻( )。
①  增大
②  减小
③  不变   
④  不一定
【判断题】 电压串联负反馈能使电路的输入电阻变大。
①  正确
②  错误
【判断题】 场效应管同双极型三极管相比,其输入电阻大。
①  正确
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【判断题】 要使放大电路的输出电流稳定并使输入电阻增大,则应引入电流串联负反馈。
①  正确
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【单选题】 下列是三极管各个极的电位,处于放大状态的三极管为
①  VB=0.7V VE=0V VC=0.3V
②  VB=-6.7V VE=-7.4V VC=-4V
③  VB=-3V VE=0V VC=6V
随机题目
【单选题】 A _________ is ten years
①  decade
②  century
③  millennium
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【单选题】 Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight(困境)while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump(垃圾场)was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.What are the “two birds” that the city government kills with only one stone?
①  Both the sheepherder and goat-keeper will work for the city for $25,000.
②  The danger of fire and providing breakfast and lunch for the work crews.
③  The danger of fire and the overflowing dump.
④  The city government can save some money and the goat-keeper has a new job.
【单选题】 You have to work hard if you want to __________ in your courses.
①  achieve
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③  win
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【单选题】 I will tell you____________ you have to study biology.
①  why
②  which
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【单选题】 Susan: How do you do, Mrs. White.Mrs. White: How do you do, Susan. I’m glad you can join us. __________
①  Dont be shy.
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【单选题】 I ___________ a short rest before we continue the work.
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【单选题】 Visitor: How do I get to the bank? I have no knowledge of this area.   Policeman: Cross the road and turn left at the other side. __________ for about 100 meters and the bank is to your left.
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【判断题】 答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”Jim wasnt a coward and he hated the Fascists deeply.
①  正确
②  错误
【判断题】 答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”Before Ford introduced the assembly line, each car was build by hand.
①  正确
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【判断题】 We are all worried about him with that, but he thinks nothing of it.划线部分应该翻译成“无法理解”
①  正确
②  错误