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Strain()
A．occurs when a force is applied to a material
B．has units of Newtons／Newtons
C．occurs only at room temperature
D．all of the above
答案
更多“Strain（)A．occurs when a force is applied to a materialB．has units of Newtons／NewtonsC．”相关的问题
第1题
Fatigue()
A．occurs under cyclic loading
B．is unaffected by sharp angles in a material
C．only occurs in resin composites
D．all of the above
第2题
Elastic strain()
A．is strain thatpermanently remains,when the lvadcausing it is removed
B．occurs below the proportional limit
C．is also known as permammt deformation
D．none of the above
第3题
Mrs. Smith didn’t call the police because______.
A．she was on the bus
B．she was not sure whether she had the ten pound notes with her
C．she was’ too angry to do so
D．she didn’t like to make trouble for others
第5题
A、tension
B、strain
C、stress
D、intensity
第6题
【D9】
JOSE: PAMELA, CAN YOU COME TO A MEETING ON FRIDAY？ PAMELA: I"M NOT SUR
E.【D8】______WHEN ARE YOU HAVING IT？ JOSE: 【D9】______ PAMELA: LET ME GET BACK TO YOU IN A FEW MINUTES. JOSE: SUR
E. IF I"M NOT IN, COULD YOU LEAVE A MESSAGE ON MY ANSWERING MACHINE？ PAMELA: 【D10】______ A. LET ME CHECK MY SCHEDUL
E.
B. SURE THIN
G.
C. I DON"T KNOW.
D. WE" RE PLANNING IT AROUND NOO
N.
第7题
【D8】
JOSE: PAMELA, CAN YOU COME TO A MEETING ON FRIDAY？ PAMELA: I"M NOT SUR
E.【D8】______WHEN ARE YOU HAVING IT？ JOSE: 【D9】______ PAMELA: LET ME GET BACK TO YOU IN A FEW MINUTES. JOSE: SUR
E. IF I"M NOT IN, COULD YOU LEAVE A MESSAGE ON MY ANSWERING MACHINE？ PAMELA: 【D10】______ A. LET ME CHECK MY SCHEDUL
E.
B. SURE THIN
G.
C. I DON"T KNOW.
D. WE" RE PLANNING IT AROUND NOO
N.
第8题
【D5】
STEVE: FRANCESCA, WHAT" S YOUR FAVOURITE PIECE OF MUSIC, WOULD YOU SAY ？ FRANCESCA: I THINK IT" S "PIE JESU" BY ANDREW LLOYD-WEBBER. STEVE: REALLY？ FRANCESCA: 【D5】______ STEVE:WHEN DID YOU FIRST HEAR IT？ FRANCESCA: OH, ABOUT FIVE YEARS AGO MY SISTER WAS IN A CHOIR CONCERT AND THAT WAS THE FIRST TIME I HEARD IT,AND I THOUGHT IT WAS REALLY BEAUTIFUL.【D6】______WHAT"S YOUR FAVOURITE？ STEVE: WELL, IT" S A BIG PIEC
E. IT" S MAHLER" S "SECOND SYMPHONY". FRANCESCA:OH, YEAH, YEAH! WHE
N...WHEN DID YOU FIRST HEAR THAT？ STEVE: 【D7】______ FRANCESCA:A LONG TIME AGO. STEVE: YEA
H. BUT IT STAYS WITH ME AND I" VE SEEN IT PERFORMED SEVERAL TIMES SINCE THE
N. A. UR
N...ABOUT 1953. I THINK,WHEN I WAS EIGHTEE
N.
B. WHAT ABOUT YOU？
C. YEAH, I REALLY LIKE THAT.
D. ACTUALLY, I DON"T LIKE IT THAT MUC
H.
第9题
【D7】
STEVE: FRANCESCA, WHAT" S YOUR FAVOURITE PIECE OF MUSIC, WOULD YOU SAY ？ FRANCESCA: I THINK IT" S "PIE JESU" BY ANDREW LLOYD-WEBBER. STEVE: REALLY？ FRANCESCA: 【D5】______ STEVE:WHEN DID YOU FIRST HEAR IT？ FRANCESCA: OH, ABOUT FIVE YEARS AGO MY SISTER WAS IN A CHOIR CONCERT AND THAT WAS THE FIRST TIME I HEARD IT,AND I THOUGHT IT WAS REALLY BEAUTIFUL.【D6】______WHAT"S YOUR FAVOURITE？ STEVE: WELL, IT" S A BIG PIEC
E. IT" S MAHLER" S "SECOND SYMPHONY". FRANCESCA:OH, YEAH, YEAH! WHE
N...WHEN DID YOU FIRST HEAR THAT？ STEVE: 【D7】______ FRANCESCA:A LONG TIME AGO. STEVE: YEA
H. BUT IT STAYS WITH ME AND I" VE SEEN IT PERFORMED SEVERAL TIMES SINCE THE
N. A. UR
N...ABOUT 1953. I THINK,WHEN I WAS EIGHTEE
N.
B. WHAT ABOUT YOU？
C. YEAH, I REALLY LIKE THAT.
D. ACTUALLY, I DON"T LIKE IT THAT MUC
H.
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.
