单选题The NIF process of nuclear fusion involves ______.A high lab temperatures of about 10 million CelsiusB ultra powerful lasers being used to produce huge gravitational pressureC deuterium and helium being fused together to form tritiumD delivering ultrav

题目
单选题
The NIF process of nuclear fusion involves ______.
A

high lab temperatures of about 10 million Celsius

B

ultra powerful lasers being used to produce huge gravitational pressure

C

deuterium and helium being fused together to form tritium

D

delivering ultraviolet energy to hit the target

相似考题

1.What are people worried about?()A .unpredictable futureB .being disabled by technologyC. turning the Earth into a huge dump by technologyD .abuse of technology

2.In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）A.serialupB.clockC.clockrateD.dcerateE.dterate

3.共用题干 If you made a list of all the jobs performed by the different kinds of energy,you would fill many pages.Nuclear energy is used in some areas of the United States.But there are dangers.Waste materials from nuclear______(51)would destroy life if they leaked______(52)the land.When nuclear energy is produced,a lot of______(53)is produced,too,50 a flow of lake or ocean water 15 used to cool the operations.Then the water______(54)to its source.If the returning water were too hot,it would destroy fish and other______(55).Cow manure is being used to produce a kind of______(56).The manure from farms is put into a machine to convert it to a liquid.Then the gas 15 formed______(57)a natural process.If the converter were not 50______(58)at the present time,it would be used in many places to provide______(59).Garbage has become an energy source.It______(60)to oil,steam,or electricity,or it is used on the land.But recent______(61)about power supplies has led to increased interest in the use of wind______(62)a source of electrical power.Windmills are clean and they______(63)no waste.And they use a______(64)resource.Some scientists consider that wind energy systems can fulfill a valuable______(65)in meeting the energy needs of industrialized nations and of the developing world._________(61)A:consideration B:thoughtC:concern D:interest

4.Which statement about the ip classless router command is true?()A. The ip classless command is enabled by default in recent versions of IOS.B. The ip classless command should only be enabled when static routing is being used instead of a routing protocol.C. The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.D. The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.

更多“单选题The NIF process of nuclear fusion involves ______.A high lab temperatures of about 10 million CelsiusB ultra powerful lasers being used to produce huge gravitational pressureC deuterium and helium being fused together to form tritiumD delivering ultrav”相关问题

  • 第1题：

    共用题干
    If you made a list of all the jobs performed by the different kinds of energy,you would fill many pages.
    Nuclear energy is used in some areas of the United States.But there are dangers.Waste materials from nuclear______(51)would destroy life if they leaked______(52)the land.When nuclear energy is produced,a lot of______(53)is produced,too,50 a flow of lake or ocean water 15 used to cool the operations.Then the water______(54)to its source.If the returning water were too hot,it would destroy fish and other______(55).
    Cow manure is being used to produce a kind of______(56).The manure from farms is put into a machine to convert it to a liquid.Then the gas 15 formed______(57)a natural process.If the converter were not 50______(58)at the present time,it would be used in many places to provide______(59).
    Garbage has become an energy source.It______(60)to oil,steam,or electricity,or it is used on the land.
    But recent______(61)about power supplies has led to increased interest in the use of wind______(62)a source of electrical power.Windmills are clean and they______(63)no waste.And they use a______(64)resource.Some scientists consider that wind energy systems can fulfill a valuable______(65)in meeting the energy needs of industrialized nations and of the developing world.

    _________(53)
    A:high temperature
    B:hot air
    C:heat
    D:warmth

    答案：C
    解析：
    station“站”;factory“工厂”;work“工厂”;firm“公司”。根据下文内容，这里应该是“核电站”，因此选A。
    into“进入……”;onto“在……表面”;on“在……上”;to“去……”。根据下文内容，这里应该是“从核电站里排放的废气物质如果遗漏在地面上”，因此选B。
    high temperature“高j" ;hot air“热气”;heat“热量”;warmth"温暖”。本句意思是：“产生核能的同时会产生大量热能”。因此选C。
    get“得到”;come“来”;fall“落下”;return“返回”，最符合题意。本句意思是：“水会随后流回”。因此选D。
    根据常识，海洋里有生命的不止是动物或者植物，而是所有有生命的生物。本句意思是：“如果流回的水太热就会杀死鱼类和其他海里的生命”。因此选C。
    gas“天然气”;liquid“液体”;solid“固体”; air“空气”。根据下文，本句意思是：“牛粪被用来生产一种天然气”。因此选A。
    by“被…." ;through“通过……方式”;with“与……一起”;from“从……”。本句意思是：“通过自然过程形成天然气”。若用by会有be formed by结构中“构成”的被动式的竣义，因此选B。
    expensive"昂贵的”;complicated“复杂的”;rare"稀少的”;troublesome"麻烦的”。本句意思是：“如果目前转换器不昂贵，就能被广泛用来提供能源”。因此选A。
    oil“油”;liquid“液体”;power“电力”;fuel“能源”。此处需要的内容是指能源总称，而不是具体的一类能源，因此选D。
    此处的意思是“被转换成……”，正确的形式是be converted to...。本句意思是：“它能被转变为油、蒸汽或电，在农村也有用途”。因此选D。
    consideration“考虑”;thought“想法”;concern“关心的事”;interest“兴趣”。根据上下文此处应指对能源的关注，因此选C。
    like“像……”;as“作为……”;for“为……”;from“从……”。根据本句意思，应选B。
    give“给”;deposit“存放”;make“制作”;leave“留下”。本句意思是：“没有遗留污染物”。因此选D。
    measureless“不可坝d量的”; limitless“无限的”; boundless“无边无际的”; endless“没完没了的”。此处的意思是：“风力发电有无限的能量来源”。因此选B。
    role“角色”; duty“职责”; service“服务”; function“功能”。本句意思是： “一些科学家认为风能在满足工业国家和发展中国家的能源需求方面扮演着很有价值的角色”。因此选A。

  • 第2题：

    Which of the following is the MOST important reason for referencing the HCL？（）

    • A、 To ensure that all hardware being used has previously been tested
    • B、 To ensure that all hardware being used has the latest firmware
    • C、 To ensure that all hardware being used is the most energy efficient
    • D、 To ensure that all hardware being used can be upgraded in the future

    正确答案:A

  • 第3题：

    A shipping department is reporting that a laser printer in the receiving area is becoming jammed because the printer attempts to pull several sheets of paper for each print. Which of the following may be the cause？（）

    • A、Humidity is causing the paper to stick together.
    • B、The paper is sticking to the corona wire and causing the jam.
    • C、A4 paper is being used and may not be supported by laser printers.
    • D、The fusion roller is dirty and pulling too many sheets of paper.

    正确答案:A

  • 第4题：

    单选题
    The retailer and manufacturer （） about 5-10% of their merchandise being returned
    A

    forecast  

    B

    anticipate  

    C

    participate  

    D

    record


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    We can conclude from the passage about nuclear fusion EXCEPT ______.
    A

    it has great potential to produce abundant clean energy

    B

    NIF has just finished constructing a practical fusion reactor

    C

    extreme temperatures are needed to work it

    D

    it has not been successfully used to produce net energy gain in labs


    正确答案： D
    解析：
    题目问的是：我们不能从文中得出核聚变的什么信息？根据文章第1段中的“The US has finished constructing a huge physics experiment—NIF”可知，美国结束了NIF的大型物理试验，而不是NIF结束聚变反应堆。故选B。

  • 第6题：

    单选题
    In the conversion of the soil at the Hallside site, ______.
    A

    two types of worms are being used.

    B

    three types of worms are being used.

    C

    many types of worms are being used.

    D

    thousands of different types of worms are being used.


    正确答案： A
    解析：
    根据题干关键词conversion，Hallside site可定位到E段第二句“This will be converted into usable soil by about 21,000 Lubricus territories (garden lobworms) and Aporrectodea longa (black headed worms) that have been let loose on the site”，由此可知将这块土地转换成可用的土壤用到了两种蠕虫。所以正确答案为A。

  • 第7题：

    单选题
    A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.
    A

    at a high rate of speed

    B

    under oars

    C

    against the wind

    D

    with the wind


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）
    A

    serialup

    B

    clock

    C

    clockrate

    D

    dcerate

    E

    dterate


    正确答案： E
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following is the MOST important reason for referencing the HCL？（）
    A

     To ensure that all hardware being used has previously been tested

    B

     To ensure that all hardware being used has the latest firmware

    C

     To ensure that all hardware being used is the most energy efficient

    D

     To ensure that all hardware being used can be upgraded in the future


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    The command echo $! will produce what output？（）
    A

     the process id of last background command

    B

     the exit status of the last command

    C

     the exit status of the last background command

    D

     the process id of the current shell

    E

     the name of the command being executed


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    An indication of a diesel engine air intake being partially clogged, is （）.
    A

    low firing pressure and low exhaust temperatures

    B

    low firing pressure and normal exhaust temperatures

    C

    high firing pressure and low exhaust temperatures

    D

    high firing pressure and high exhaust temperatures


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Although no proof yet exists of the electromagnetic disturbances observed being the results of nuclear weapons testing, diplomats are treating the situation with utmost delicacy.
    A

    of the electromagnetic disturbances observed being the results of nuclear weapons testing

    B

    regarding the observed electromagnetic disturbances having been the results of nuclear weapons testing

    C

    that the electromagnetic disturbances observed were the results of nuclear weapons testing

    D

    that nuclear weapons testing resulted in the electromagnetic disturbances having been observed

    E

    that the electromagnetic disturbance observed were resulting from nuclear weapons testing


    正确答案： A
    解析：
    A、B项不符合习惯表达；D项的表达与句意不符；E项中“disturbance…were”主谓不一致，故本题选C项。

  • 第13题：

    In a lab, two routers are connected directly together using serial interfaces in a back-to-back configuration. No external DCE devices are being used. What additional command is needed to bring this link up?（）

    • A、serialup
    • B、clock
    • C、clockrate
    • D、dcerate
    • E、dterate

    正确答案:C

  • 第14题：

    The command echo $! will produce what output？（）

    • A、 the process id of last background command
    • B、 the exit status of the last command
    • C、 the exit status of the last background command
    • D、 the process id of the current shell
    • E、 the name of the command being executed

    正确答案:A

  • 第15题：

    单选题
    Which of the following is NOT true about the NIF?
    A

    NIF contains the world’s most powerful laser.

    B

    NIF experiments will not get significant results until after 2010.

    C

    NIF is by far the only experimental facility aimed at demonstrating the building blocks of nuclear fusion.

    D

    NIF is at the beginning of its experimental life.


    正确答案： C
    解析：
    题目问的是：下列关于NIF（国家点火装置）哪一项是错误的？根据文章第11段“There are currently several experimental facilities around the world aimed at demonstrating the building blocks of nuclear fusion.”可知，NIF并不是目前唯一一个致力于演示核聚变的试验性装置。故选C。

  • 第16题：

    单选题
    Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.
    A

    not good

    B

    good

    C

    better

    D

    the best


    正确答案： D
    解析： 暂无解析

  • 第17题：

    问答题
    Practice 3　　At first, as he adjusted pumps and checked temperatures, Aaron Boucher looked like any technician in the control room of an electrical plant. Then he rushed to the window and scanned the sky, to check his fuel supply.　　Mr. Boucher was battling clouds, timing the operations of his power plant to get the most out of patchy sunshine. It is a skill that may soon be in greater demand, for the world appears to be on the verge of a boom in a little-known but promising type of solar power.　　It is not the kind that features shiny panels bolted to the roofs of houses. This type involves covering acres of desert with mirrors that focus intense sunlight on a fluid, heating it enough to make steam. The steam turns a turbine and generates electricity.　　The technology is not new, but it is suddenly in high demand. As prices rise for fossil fuels and worries grow about their contribution to global warming, solar thermal plants are being viewed as a renewable power source with huge potential.　　After a decade of no activity, two prototype solar thermal plants were recently opened in the United States, with a capacity that could power several big hotels, neon included, on the Las Vegas Strip, about 20 miles north of here. Another 10 power plants are in advanced planning in California, Arizona and Nevada.　　On sunny afternoons, those 10 plants would produce as much electricity as three nuclear reactors, but they can be built in as little as two years, compared with a decade or longer for a nuclear plant. Some of the new plants will feature systems that allow them to store heat and generate electricity for hours after sunset.　　At Nevada Solar One the other day, Mr. Boucher, 30, ran the computerized control room. He was trying to produce as much electricity as possible while saving heat to tide the plant over as clouds cast episodic shadows on the solar array. “I’ve been fighting it all day,” he said.　　Imperceptibly, in the dusty wind of the high desert, 182,000 mirrors moved from east to west, tracking the sun across the sky.

    正确答案：
    【参考译文】
    安让·布切尔看上去和电站控制室中其他任何一位技术人员一样,他首先调整了校泵并检查了温度,然后跑到窗户边望了望天空,以确定燃料的供给是否适合。
    布切尔先生正和云层较量,调整电站的操作以便从四散的阳光中获得最大的能量。这种技术在不久可能就会倍受青睐,因为世界各地的人们对这种知之甚少但却很有前景的太阳能源正趋之若鹜。
    这可不是那种装在屋顶带有闪闪发光镶板的太阳能设备,而是在数以英亩计的沙漠上铺设聚光镜,将阳光聚集到一种液体上,加热使其变成蒸汽,然后蒸汽带动涡轮机从而产生电能。
    这不是一种新的技术,但却很受青睐。随着化石燃料价格的上涨及人们对其所对全球变暖带来的影响的担忧,太阳能热电站被认为是一种极具潜力的可再生能源的来源。
    在沉寂十年之后,美国最近新建了两座太阳能热电站,另外10个类似的电站正在筹建之中,计划建于加州、亚利桑那州和内华达州。
    在阳光明媚的下午,这10座电站所发的电量能达到3个核反应堆所发出的电量,但这些电站只需要2年久可以建成,而一个核电站需要10年甚至更长的时间才能建成。一些新建的电站带有新的系统,可以储存热能,从而保证电站在日落后能继续工作数小时。
    这天,在内华达一号太阳能电站,30岁的布切尔先生在计算机控制的控制室中进行操作。他正尽量使电站能多发点,同时他也在存储热能以便当云层遮住聚光镜是能够使电站继续工作。他说:“我一整天都在和云层较量。”
    在风沙四起的沙漠,182000面聚光镜悄无声息的随着天空的太阳从东边转向西边。
    解析： 暂无解析

  • 第18题：

    单选题
    The Junos OS blocks an HTTP request due to the category of the URL.Which form of Web filtering is being used?（）
    A

    redirect Web filtering

    B

    integrated Web filtering

    C

    categorized Web filtering

    D

    local Web filtering


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Which statement about the ip classless router command is true?（）
    A

    The ip classless command is enabled by default in recent versions of IOS.

    B

    The ip classless command should only be enabled when static routing is being used instead of a routing protocol.

    C

    The ip classless command should be enabled by the network administrator whenever RIPv1 or IGRP is being used.

    D

    The ip classless command should be enabled by the network administrator whenever OSPF, RIPv2, or EIGRP is being used.


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    A shipping department is reporting that a laser printer in the receiving area is becoming jammed because the printer attempts to pull several sheets of paper for each print.Which of the following may be the cause？（）
    A

    The paper is sticking to the corona wire and causing the jam.

    B

    Humidity is causing the paper to stick together.

    C

    A4 paper is being used and may not be supported by laser printers.

    D

    The fusion roller is dirty and pulling too many sheets of paper.


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Hiper is being planned ______.
    A

    to compete with NIF

    B

    because NIF experiment, even successful, would not produce enough energy to run a nuclear fusion plant

    C

    to use the same laser technology but on a larger scale

    D

    to demonstrate the feasibility of nuclear fusion


    正确答案： B
    解析：
    题目问的是：Hiper正在被设计的原因是什么？根据文章的倒数第7段中的“This is right for the demonstration of the physics ‘proof of principle’, but does not meet the requirement of a laser fusion power plant.”可知，试验很好地演示了物理原理的证明，但是不能满足激光核聚变动力装置的需求，也就是说没有足够的能量来运作核聚变装置。故选B。

  • 第22题：

    单选题
    When the BGP path selection process is being performed on a Cisco router, which BGP attribute is used first when determining the best path?（）
    A

    local preference

    B

    MED

    C

    weight

    D

    or igin

    E

    next - hop

    F

    AS - path


    正确答案： F
    解析： 暂无解析

  • 第23题：

    单选题
    When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions （） which can be used to measure temperature.
    A

    a current will flow

    B

    a power will develop

    C

    a heat will flow

    D

    a pressure will produce


    正确答案： B
    解析： 暂无解析

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