6[简答题] 运算电路如图所示，设集成运放的最大输出电压为±12V，R1=5kΩ，输入电压uI=0.2V。（1）若要求电压放大倍数等于5，试计算Rf及平衡电阻R2。（2）试求电阻R1开路情况下的输出电压uO。（3）试求电阻Rf开路情况下的输出电压uO。点击打开链接 - 查题网

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河南成教 / 电子技术

6[简答题]
运算电路如图所示，设集成运放的最大输出电压为±12V，R1=5kΩ，输入电压uI=0.2V。（1）若要求电压放大倍数等于5，试计算Rf及平衡电阻R2。（2）试求电阻R1开路情况下的输出电压uO。（3）试求电阻Rf开路情况下的输出电压uO。点击打开链接

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电子技术

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题型描述: 阅读理解 In the early days of the internet, many people worried that as people in the rich world embraced new computing and communications technologies, people in the poor world would be left stranded on the wrong side of a “digital divide.” Yet the debate over the digital divide is founded on a myth — hat plugging poor countries into the internet will help them to become rich rapidly. This is highly unlikely, because the digital divide is not a problem in itself, but a symptom of deeper, more important divides: of income, development and literacy. Fewer people in poor countries than in rich ones own computers and have access to the internet simply because they are too poor, are illiterate, or have other more immediate concerns, such as food, health care and security. So even if it were possible to wave a magic wand and cause a computer to appear in every household on earth, it would not achieve very much: a computer is not useful if you have no food or electricity and cannot read. Yet such Wand-waving — through the construction of specific local infrastructure projects such as rural telecenters — is just the sort of thing for which the UN's new fund is intended. This sort of thing is the wrong way to go about addressing the inequality in access to digital technologies: it is treating the symptoms, rather than the underlying causes. The benefits of building rural computing centers, for example, are unclear. Rather than trying to close the divide for the sake of it, the more sensible goal is to determine how best to use technology to promote bottom-up development. And the answer to that question turns out to be remarkably clear: by promoting the spread not of PCs and the Internet, but of mobile phones.英语阅读II

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