【单选题】【消耗次数:1】
组合放大电路的输出级采用射极输出方式是为了使( )。
电压放大倍数高
输出电流小
带负载能力强
参考答案:
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相关题目
【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
②  错误
【判断题】 放大电路的输出电阻越大,其带负载能力越强。
①  正确
②  错误
【判断题】 为了稳定三极管放大电路交流输出电压,采用电压负反馈。
①  正确
②  错误
【判断题】 共集电极放大电路具有电压放大倍数近似等于1,输入电阻小,输出电阻大等特点,所以常用在输入级,输出级或缓冲级。
①  正确
②  错误
【单选题】 射极输出器的电压放大倍数( )。
①  等于1
②  大于1
③  小于1,接近1
【判断题】 集成运放的输出级的主要特点是输出电阻低,带负载能力强。
①  正确
②  错误
【单选题】 为了稳定放大电路的输出电压,那么对于高内阻的信号源来说,放大电路应引入( )负反馈。
①  电流串联
②  电流并联
③  电压串联
④  电压并联
【单选题】 要求放大电路取用信号源的电流小,而且输出电压稳定,应选(   )负反馈。
①  电压并联
②  电流并联
③  电压串联
④  电流串联
【单选题】 从发射极输出信号的放大电路叫( )放大电路。
①  共射
②  共基
③  共集
【单选题】 放大电路在负载开路时的输出电压为4V,接入3k? 的负载电阻后输出电压降为3V,这说明放大电路的输出电阻为( )。
①  10k?
②  2 k?
③  1 k?
④  0.5 k?
随机题目
【单选题】 阅读理解:阅读下列短文,回答文后问题,选择最佳答案: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. 1. The city government faces a serious problem because __________.
①  A. fires destroyed thirty homes in a neighborhood four years ago
②  B. the speed of rebuilding the houses is really too slow
③  C. the overgrowing plants in this area have made the city look terrible
④  D. the overgrowing plants in this area have become a big danger of fire
【单选题】 阅读理解:阅读下列短文,回答文后问题,选择最佳答案: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.2. Why was the goat-keeper chosen to remove the bushes?
①  A. Because he offered to do it for the lower price.
②  B. Because it was easier to transport his goats.
③  C. Because his goats can do the job better.
④  D. Because the city wanted to raise more goats.
【单选题】 阅读理解:阅读下列短文,回答文后问题,选择最佳答案: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.3. According to the passage, __________.
①  A. the sheepherder offered to do the job for $50,000
②  B. the lowest bid to remove the bushes was $50,000
③  C. the sheepherder and the goat-keeper were both addicted to surfing the Internet
④  D. hiring goats todo the job saved the city government lots of money
【单选题】 阅读理解:阅读下列短文,回答文后问题,选择最佳答案: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.4.What are the “two birds” that the city government kills with only one stone?
①  A. Both the sheepherder and goat-keeper will work for the city for $25,000.
②  B. The danger of fire and providing breakfast and lunch for the work crews.
③  C. The danger of fire and the overflowing dump.
④  D. The city government can save some money and the goat-keeper has a new job.
【单选题】 阅读理解:阅读下列短文,回答文后问题,选择最佳答案: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.5.What can be inferred from the passage?
①  A. The city will remove the bushes in this area regularly.
②  B. The goat-keeper asked for $50,000 to kill the birds with stones.
③  C. The goat-keeper was invited to San Diego to do some sightseeing.
④  D. The city government was not kind to the people who worked for it.
【判断题】 阅读课文II. Television and Children,判断正误4. The negative influence of television can be avoided.
①  正确
②  错误
【判断题】 阅读课文II. Television and Children,判断正误1. Television is an excellent invention that may help with education
①  正确
②  错误
【判断题】 阅读课文II. Television and Children,判断正误2. Television companies show only educational programs for children.
①  正确
②  错误
【判断题】 阅读课文II. Television and Children,判断正误3.When a program attracts moderate audiences, it is discountinued.
①  正确
②  错误
【判断题】 阅读课文II. Television and Children,判断正误5.Parents and teachers should control what their chidren watch.
①  正确
②  错误