题目内容
（请给出正确答案）
A、许多事物中都包含不如动能明显的势能。
B、不如动能明显的势能存在于许多事物中。
C、势能虽然不像动能那样明显，但它存在于许多物体之中。
D、当势能不像动能那样明显时，便可在许多物体中找到它。
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更多“Potential energy that is not s…”相关的问题
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.
A.It may not prove an environmental crisis at all.
B.It is an issue requiring worldwide commitments.
C.Serious steps have been taken to avoid or stop it.
D.Very little will be done to bring it under control.
根据下面内容，回答题：
Japan"s 24-hour convenience stores， already struggling with lagging sales and growth， may soon face yet another threat——moves to limit business hours and close the stores late at night. The prefecture of Saitama， which borders Tokyo， may follow in the footsteps of the western city of Kyoto and urge convenience stores to close during late night hours in an effort to limit carbon dioxide emissions.
Kyoto， a former capital， wants to persuade convenience and other 24-hour stores to close late at night so as to improve evening views of the city and cut down on energy use. The Nikkei said closures could last from 11 p.m. to 7 a.m. The move is strongly opposed by the industry， which fears a withering impact on an already troubled sector also grappling with the. specter of a higher tobacco tax， which could hit overall sales.
"Even if we only operate the stores for 16 hours， we can"t stop the refrigerators，" said Toshiro Yamaguchi， the president of Seven-Eleven Japan Co. He said such cuts in operating hours wouldreduce each store"s profit by 20 percent. "If this happens， our current business model will lose its foundation. "
Analysts said that while it is difficult to estimate the potential impact of the move without a concrete plan， their overall impression was that it was likely to be negative. "This could cut profits and lead to less efficient operations and the increased loss of opportunities，" said Masafumi Shoda， an analyst. " But it depends on the store——urban stores do better than others. There are some in the countryside that are inefficient. ""
Which Japanese city was the first to try to limit convenience store hours？ 查看材料
A.Saitama.
B.Tokyo.
C.Kyoto.
D.Nagoya.
A.When
B.While
C.Unless
D.Until
A.puzzling
B.puzzled
C.surprised
D.surprising
A.A. To inform
B.B. To request
C.C. To record
A.which
B.that
C.in which
D.where
A.““th“an“o“tha“i“’to“web”及“homepage”等等
B.“software?”
C.technical”D“drawing”
