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[单选题]
下列属于系统软件的是()。
A.PowerPoint 2010
B.Windows 7
C.Foxmail
D.Excel 2010
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.PowerPoint 2010
B.Windows 7
C.Foxmail
D.Excel 2010
如果结果不匹配，请 联系老师 获取答案
更多“下列属于系统软件的是（)。A、PowerPoint 2010…”相关的问题
A.计算机硬件系统的基本功能是接受计算机程序，并在程序控制下完成数据输入和数据输出任务
B.软件系统建立在硬件系统的基础上，它使硬件功能得以充分发挥，并为用户提供一个操作方便、工作轻松的环境
C.没有装配软件系统的计算机不能做任何工作，没有实际的使用价值
D.一台计算机只要装入系统软件后，即可进行文字处理或数据处理工作"
A.store
B.secure
C.provide
D.ensure
将英语短文译为中文
3 Self-Powered Nanotech (10分)
Nanosize machines need still tinier power plants
By Zhong Lin Wang
The watchmaker in the 1920s who devised the self-winding wristwatch was on to a great idea: mechanically harvesting energy from the wearer’s moving arm and putting it to work rewinding the watch spring.
Today we are beginning to create extremely small energy harvesters that can supply electrical power to the tiny world of nanoscale devices, where things are measured in billionths of a meter. We call these power plants nanogenerators. The ability to make power on a minuscule scale allows us to think of implantable biosensors that can continuously monitor a patient’s blood glucose level, or autonomous strain sensors for structures such as bridges, or environmental sensors for detecting toxins — all running without the need for replacement batteries. Energy sources are desperately needed for nanorobotics, microelectromechanical systems (MEMS), homeland security and even portable personal electronics. It is hard to imagine all the uses such infinitesimal generators may eventually find.
In Brief
★Nanotechnology has huge potential — but those minuscule devices will need a power source that is better than a battery.
★ Waste energy, in the form. of vibrations or even the human pulse, could provide sufficient power to run such tiny gadgets.
★ Arrays of piezoelectric nanowires could capture and transmit that waste energy to nanodevices.
★ Medical devices will likely be a major application. A pacemaker’s battery could be charged so it would not need replacing, or implanted wireless nanosensors could monitor blood glucose for diabetics.
