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单选题
How is a Thin Film filter fabricated？ （）
A
The glass core is doped with an Erbium in periodic segments of the fiber.
B
Layers of high index ？and low index ？material are deposited on a glass substrate.
C
Thin layers of silica glass are placed onto wafers to produce a prism-like effect.
D
Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.
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更多 “单选题How is a Thin Film filter fabricated？ （）A The glass core is doped with an Erbium in periodic segments of the fiber.B Layers of high index ？and low index ？material are deposited on a glass substrate.C Thin layers of silica glass are placed onto wafers to produce a prism-like effect.D Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.” 相关考题
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--- How do you like the film?--- __________.A. It’s very good. I like it.B. I’m fine, thank you.C. Sorry, I don’t know about it.
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– How about the film last night? – ()
A.What a waste of time!B.It‘s a pity it‘s too late to mend..C.Not as good as I had expected.D.Yes, the more, the better.
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考题
Click the Exhibit button. Which type of multiplexer is shown in the exhibit?()
A. Thin Film filterB. Fiber Bragg GratingC. Arrayed Wave GuideD. Erbium fiber amplifier
考题
How is a Thin Film filter fabricated?()
A. The glass core is doped with an Erbium in periodic segments of the fiber.B. Layers of high index ?and low index ?material are deposited on a glass substrate.C. Thin layers of silica glass are placed onto wafers to produce a prism-like effect.D. Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.
考题
共用题干
Better Solar Energy Systems:More Heat,More LightSolar photovoltaic（光电的）thermal energy systems , or PVTs , generate both heat and electricity , but _________ (51)now they haven't been very good at the heat-generating part compared to a stand-alone solar thermal collector. That ' s because they operate at low temperatures to cool crystalline silicon（晶体硅）solar cells, _______(52)lets the silicon generate more electricity but isn't a very efficient way to gather heat.That's a problem of economics.Good solar hot-water systems can harvest much more energy than asolar一electric system at a substantially lower _________(53).And it's also a space problem:photovoltaiccells can_________(54)up all the space on the roof,leaving little room for thermal applications.In a pair of studies,Joshua Pearce,an associate professor of materials science and engineering,has de- vised a_________(55)in the form of a better PVT made with a different kind of silicon.Most solar panels are made with crystalline silicon,but you can also make solar cells out of amorphous（非晶形的）silicon , commonly known________( 56 ) thin-film silicon. They don ' t create as much elec-tricity,but they are lighter,flexible,and cheaper. And,because they________(57)much less silicon,they have a greener footprint._________(58),thin-film silicon solar cells are vulnerable to some bad一news physics in the form of the Staebler-Wronski effect."That means that their efficiency drops when you_________(59)them to light一pretty much the worst possible effect for a solar cell,"Pearce explains,which is one of the__________(60)thin-film solar panels make up only a small fraction of the market.However,Pearce and his team found a_______(61)to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new________(62)of PVT. You don't have to cool down thin-film sili- con to make it work.In fact,Pearce's group discovered that by heating it to solar-thermal operating tempera- tures,near the boiling_________(63)of water,they could make thicker cells that largely_________(64) the Staebler-Wronski effect.When they applied the thin-film silicon directly to a solar thermal energy collector, they also found that by baking the cell once a day,they_________(65)the solar cell's electrical efficiency by over 10 percent._________(57)A:retrieveB:requireC:mergeD:exchange
考题
共用题干
Better Solar Energy Systems: More Heat, More LightSolar photovoltaic thermal energy systems,or PVTs,generate both heat and electricity,but until now they haven't been very good at the heat-generating part compared to a stand-alone solar thermal collector. That's because they operate at low temperatures to cool crystalline silicon solar cells,which lets the silicon generate more electricity but isn't a very efficient way to gather heat.That's a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower cost. And it's also a space problem:photovol-taic cells can take up all the space on the roof,leaving little room for thermal applications.In a pair of studies,Joshua Pearce,an associate professor of materials science and engineer-ing,has devised a solution in the form of a better PVT made with a different kind of silicon.His research collaborators are Kunal Girotra from Thin Silicon in California and Michael Pathak and Stephen Harrison from Queen's University,Canada.Most solar panels are made with crystalline silicon,but you can also make solar cells out of amorphous silicon,commonly known as thin-film silicon.They don't create as much electricity, but they are lighter,flexible,and cheaper. And,because they require much less silicon,they have a greener footprint. Unfortunately,thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect."That means that their efficiency drops when you expose them to light-pretty much the worst possible effect for a solar cell,"Pearce explains,which is one of the reasons thin-film solar panels make up only a small fraction of the market.However,Pearce and his team found a way to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new type of PVT. You don't have to cool down thin-film silicon to make it work.In fact,Pearce's group discovered that by heating it to solar-thermal operating temperatures,near the boiling point of water,they could make thicker cells that largely overcame the Staebler-Wronski effect. When they applied the thin-fulm silicon directly to a solar thermal en-ergy collector,they also found that by baking the cell once a day,they boosted the solar cell's e-lectrical efficiency by over 10 percent. One of the problems PVTs have is that______.A: their thermal applications are costlyB: they are too expensive to affordC: they occupy too much spaceD: it is hard to fix them on the roof
考题
共用题干
Better Solar Energy Systems: More Heat, More LightSolar photovoltaic thermal energy systems,or PVTs,generate both heat and electricity,but until now they haven't been very good at the heat-generating part compared to a stand-alone solar thermal collector. That's because they operate at low temperatures to cool crystalline silicon solar cells,which lets the silicon generate more electricity but isn't a very efficient way to gather heat.That's a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower cost. And it's also a space problem:photovol-taic cells can take up all the space on the roof,leaving little room for thermal applications.In a pair of studies,Joshua Pearce,an associate professor of materials science and engineer-ing,has devised a solution in the form of a better PVT made with a different kind of silicon.His research collaborators are Kunal Girotra from Thin Silicon in California and Michael Pathak and Stephen Harrison from Queen's University,Canada.Most solar panels are made with crystalline silicon,but you can also make solar cells out of amorphous silicon,commonly known as thin-film silicon.They don't create as much electricity, but they are lighter,flexible,and cheaper. And,because they require much less silicon,they have a greener footprint. Unfortunately,thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect."That means that their efficiency drops when you expose them to light-pretty much the worst possible effect for a solar cell,"Pearce explains,which is one of the reasons thin-film solar panels make up only a small fraction of the market.However,Pearce and his team found a way to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new type of PVT. You don't have to cool down thin-film silicon to make it work.In fact,Pearce's group discovered that by heating it to solar-thermal operating temperatures,near the boiling point of water,they could make thicker cells that largely overcame the Staebler-Wronski effect. When they applied the thin-fulm silicon directly to a solar thermal en-ergy collector,they also found that by baking the cell once a day,they boosted the solar cell's e-lectrical efficiency by over 10 percent. Which of the following is NOT mentioned as an advantage of thin-film silicon solar cells?A:.They are electrically efficient.B: They are less expensive.C:.They are flexible.D: They are environment friendly.
考题
共用题干
Better Solar Energy Systems: More Heat, More LightSolar photovoltaic thermal energy systems,or PVTs,generate both heat and electricity,but until now they haven't been very good at the heat-generating part compared to a stand-alone solar thermal collector. That's because they operate at low temperatures to cool crystalline silicon solar cells,which lets the silicon generate more electricity but isn't a very efficient way to gather heat.That's a problem of economics. Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower cost. And it's also a space problem:photovol-taic cells can take up all the space on the roof,leaving little room for thermal applications.In a pair of studies,Joshua Pearce,an associate professor of materials science and engineer-ing,has devised a solution in the form of a better PVT made with a different kind of silicon.His research collaborators are Kunal Girotra from Thin Silicon in California and Michael Pathak and Stephen Harrison from Queen's University,Canada.Most solar panels are made with crystalline silicon,but you can also make solar cells out of amorphous silicon,commonly known as thin-film silicon.They don't create as much electricity, but they are lighter,flexible,and cheaper. And,because they require much less silicon,they have a greener footprint. Unfortunately,thin-film silicon solar cells are vulnerable to some bad-news physics in the form of the Staebler-Wronski effect."That means that their efficiency drops when you expose them to light-pretty much the worst possible effect for a solar cell,"Pearce explains,which is one of the reasons thin-film solar panels make up only a small fraction of the market.However,Pearce and his team found a way to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new type of PVT. You don't have to cool down thin-film silicon to make it work.In fact,Pearce's group discovered that by heating it to solar-thermal operating temperatures,near the boiling point of water,they could make thicker cells that largely overcame the Staebler-Wronski effect. When they applied the thin-fulm silicon directly to a solar thermal en-ergy collector,they also found that by baking the cell once a day,they boosted the solar cell's e-lectrical efficiency by over 10 percent. Which of the following statrnents is true?A: Thin-film silicon's electrical efficiency improves when heated up.B: New techniques have been developed to produce thin-film silicon.C: Thin-film silicon works efficiently at low temperature.D: A new material enlarging the Staebler-WronsKi effect has been created.
考题
--How about seeing a film tonight?
-- __________I haven′t been to the cinema for long.
A.Yes, that' s right.
B.Why not?
C.I guess so.
D.It' s a pity.
考题
Would you like to see a film?（）A、Yes, I'd love to.B、Do it, pleaseC、No, you like it?D、How do you do?
考题
You need to control SSH, HTTP, and Telnet access to an MX240 router through any interface.You have decided to use a firewall filter. How should you apply the firewall filter?（）A、as an outbound filter on interface fxp0B、as an outbound filter on interface lo0C、as an inbound filter on interface fxp0D、as an inbound filter on interface lo0
考题
How is a Thin Film filter fabricated?（）A、The glass core is doped with an Erbium in periodic segments of the fiber.B、Layers of high index ?and low index ?material are deposited on a glass substrate.C、Thin layers of silica glass are placed onto wafers to produce a prism-like effect.D、Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.
考题
单选题How is a Thin Film filter fabricated?（）A
The glass core is doped with an Erbium in periodic segments of the fiber.B
Layers of high index ?and low index ?material are deposited on a glass substrate.C
Thin layers of silica glass are placed onto wafers to produce a prism-like effect.D
Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.
考题
问答题Practice 3 Caesar was right. Thin people need watching. I’ve been watching them for most of my adult life, and I don’t like what I see. When these narrow fellows spring at me, I quiver to my toes. Thin people come in all personalities, most of them menacing. You’ve got your “together” thin person, your mechanical thin person, your condescending thin person, your tsk-tsk thin person, your efficiency-expert thin person. All of them are dangerous. In the first place, thin people aren’t fun. They don’t know how to goof off, at least in the best, fat sense of the word. They’ve always got to be adoing. Give them a coffee break, and they’ll jog around the block. Supply them with a quiet evening at home, and they’ll fix the screen door and lick SH green stamps. They say things like “there aren’t enough hours in the day.” Fat people never say that. Fat people think the day is too damn long already. Thin people make me tired. They’ve got speedy little metabolisms that cause them to bustle briskly. They’re forever rubbing their bony hands together and eyeing new problems to “tackle.” I like to surround myself with sluggish, inert, easygoing fat people l the kind who believe that if you clean it up today, it’ll just get dirty again tomorrow. (Suzanne Britt Jordan: That Lean And Hungry Look)
考题
单选题You need to control SSH. HTTP, and Telnet access to an MX240 router through any interface. You have decided to use a firewall filter. How should you apply the firewall filter?（）A
as an outbound filter on interface fxp0B
as an outbound filter on interface lo0C
as an inbound filter on interface fxp0D
as an inbound filter on interface lo0
考题
单选题You've configured an interface with an IP address and commited the change. You then commited a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router. How do you undo all these changes?（）A
rollback 2B
rollback 1C
rollback 0D
rollback 3
考题
单选题Enormously creative yet focused on his own commercial success, the film depicts Warhol as a complex and enigmatic figure.A
the film depicts Warhol asB
the film is a depiction of Warhol asC
Warhol in the film has been the depiction ofD
Warhol is depicted in the film asE
Warhol is depicted by the film for
考题
单选题You configured an interface with an IP address and committed the change. You then committed a change that added an exception in a firewall filter to allow this network through the filter. You realize that this work was done on the wrong router. How do you undo all these changes?（）A
rollback 2B
rollback 1C
rollback 0D
rollback 3
考题
单选题You need to control SSH, HTTP, and Telnet access to an MX240 router through any interface.You have decided to use a firewall filter. How should you apply the firewall filter?（）A
as an outbound filter on interface fxp0B
as an outbound filter on interface lo0C
as an inbound filter on interface fxp0D
as an inbound filter on interface lo0
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