We all know knowledge begins ___ practice.

A.at

B.from

C.in

D.with

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发布时间：2022-12-01

更多“We all know knowledge begins ___ practice.”相关的问题

第1题

I know he hasn't finished his work, but ____________, he is a very busy man.

A.above all

B.after all

C.for all

D.in all

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第2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.

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第3题

I don’t know the park, but it’s _______ to be quite beautiful.

A.said

B.told

C.talked

D.spoken

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第4题

She know a lot of young man, but it is not easy to choose a/an （) one who is both rich and attractive.

A.diligent

B.qualified