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[主观题]
英语中的警察用语 Call for （)
A、help
B、assistance
C、backup
D、rescue team
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题目内容
（请给出正确答案）
A、help
B、assistance
C、backup
D、rescue team
答案
更多“英语中的警察用语 Call for （)”相关的问题
第8题
A.CALL指令下面第二条指令的地址
B.(SP+1)和(SP)中存放的地址
C.(SP+5)和(SP+4)中存放的地址
D.CALL指令下面第四条指令的地址
第9题
A.CALL指令下面第4条指令的地址
B.CALL指令下面第2条指令的地址
C.(SP+1)和(SP)中存放的地址
D.(SP+5)和(SP+4)中存放的地址
第10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.
