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【简答题】
选项:daily get up since communicate while schedule everywhere in touch with use enjoy 正文:Don't we find it irresistible? The Internet is 1____________, and it is loved and used by everyone for everything. Many of us 2_____________ in the morning, and before saying hello to anyone we live with or betore even having breakfast, we sit down and use and 3____________ the Internet. We get our news, receive our mail, send our letters, write to our teachers, do our shopping, arrange our lives, 4____________ our travels, meet new friends, review all the knowledge in the universe, and most of us do it 5_____________ we are sitting in a chair looking at the screen. Can life get any better? I think any of us who make the Internet a 6___________ companion would agree that nothing has been the same 7___________ we first decided to go online. A quick survey reveals that most people will tell you that they use the Internet to stay 8_____________ others. Most of us say that writing or receiving e-mail is our number one 9________ of the Internet. We do this at home, at work, or wherever we sit down at a computer. We send and receive e-mails for fun, for personal reason, for daily business, and in all areas of our work. The Internet allows us to 10___________ from room to room, city to city, or country to country for the same price and the same immediate speed. Correspondence is king of Internet use.
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63.45V
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C.
90 V
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【单选题】在 如图所示 单相桥式整流电路中, u=141sin ω t V, 若有一个二极管断开,整流 电压平均值 U O 为 ( ) 。
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【单选题】在图18.1.3的单相桥式整流电路中,u=141sinωt V,若有一个二极管断开,整流电压平均值Uo为()。
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63.45V
B.
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C.
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【单选题】在下图所示的单相桥式整流电路中,u=141sinωtV,若有一个二极管断开,整流电压平均值UO为( )。
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