首页 > 公共课

网友您好，请在下方输入框内输入要搜索的题目：

请输入或粘贴题目内容搜题

搜题

拍照、语音搜题，请扫码下载APP

题目内容（请给出正确答案）

[单选题]

Television keeps us informed about ______ events and the latest developments in science and politics.

A.fashionable

B.current

C.brand new

D.previous

答案

查看答案

发布时间：2022-12-01

更多“Television keeps us informed about ______ events and the latest developments in science and politics…”相关的问题

第1题

Turn on the television or open a magazine and you ________ advertisements showing h

appy, balanced families.

A) are often seeing

B) often see

C) will often see

D) have often seen

点击查看答案

第2题

图中 US=10V，R=10Ω，IS=-1A。则电压U=0V。()

图中 US=10V，R=10Ω，IS=-1A。则电压U=0V。（)

A.正确

B.错误

点击查看答案

第3题

Most of us require an environment ________ outside distraction.

A、free of

B、free from

C、free away

D、free without

点击查看答案

第4题

We note from your letter of November that the price offered by us （) the subject article is found to be high.

A.on

B.at

C.to

D.for

点击查看答案

第5题

We specialize in supplying small stores in rural areas,and this assured sales outlet

enables us () of fairly large quantities.

A、of disposing

B、dispose

C、to dispose

D、disposing

点击查看答案

第6题

图示电路中，us=3V，C=1/4F，R1=2Ω，R2=4Ω。换路前电路已处于稳态，开关S在t=0时刻接通，求t≥0的电容

电压u(t)=()。

B.3V

点击查看答案

第7题

2016年大学生物专业英语期末考试英文短文3翻译答案

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.

点击查看答案