snRNPs（Small nuclear ribonucleoproteins）
snRNPs（Small nuclear ribonucleoproteins）
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DBatteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.“To provide enough power, we need certain methods with high energy density(密度)”，said Jae Kwon, assistant professor of electrical and computer engineering at MU. “The radioisotope(放射性同位素) battery can provide power density that is much higher than chemical batteries.”Kwon and his research team have been working on building a small nuclear battery, presently the size and thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although nuclear batteries can cause concerns, Kwon said they are safe.“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”His new idea is not only in the battery’s size, but also in its semiconductor(半导体). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶体结构) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.71. Which of the following is true of Jae Kwon?A. He teaches chemistry at MU.B. He developed a chemical battery.C. He is working on a nuclear energy source.D. He made a breakthrough in computer engineering.
Jae Kwon gave examples in Paragraph 4_________.A. to show chemical batteries are widely applied.B. to introduce nuclear batteries can be safely used.C. to describe a nuclear-powered system.D. to introduce various energy sources.
Liquid semiconductor is used to _________.A. get rid of the radioactive wasteB. test the power of nuclear batteries.C. decrease the size of nuclear batteriesD. reduce the damage to lattice structure.
The children stay in the nuclear family ____ they grow up and marry. Then they form. new nuclear families.A: becauseB: asC: untilD: since
It is generally agreed that the first true cities appeared about 5,000 years ago in the food-producing communities of the Middle East． The cities of Sumeria, Egypt and the Indus Valley possessed a number of characteristics that distinguished them as truly urban． The cities were very much larger and more densely populated than any previous settlement, and their function wasclearly differentiated from that of the surrounding villages． In the cities the old patterns of kinship relations were replaced by a complex hierarchy of social classes based on the specialization oflabor． Moreover, the need to keep records led to the development of writing and arithmetic, and the increased sophistication of urban society gave a new impetus to artistic expression of every kind．When the basis of city life was established in Europe the urban tradition was drawn from the ancient cities of the Middle East, via the civilization of Greece and Rome． We can trace three main phases in the growth of the West European city． The first of these is the medieval phase which extends from the beginning of the 1 lth century A．D． to about 1,500 to the beginning of the 19th century． The third is the modern phase extending from the early 19th century to the present day．Every medieval city began as a small settlement, which grew up round a geographical or cultural focal point． This would be a permanent structure such as a stronghold, a cathedral or a large church． In districts where travel and trade were well established, it might be a market, a river crossing, or a place where two or more trade routes met, in studies of urban geography the oldest part of town is referred to as the nuclear settlement． There are many small towns in Europe where it is still possible to trace the outline of the original nuclear settlement． It is, of course,much more difficult to do this in the case if a large modern city which has grown to many times its original size．It is easier to locate its original nuclear settlement of a small town__________．A.because it began as a small settlementB.because it is less developedC.because of its small sizeD.because of its location
共用题干The FamilyThe structure of a family takes different forms around the world and even in the same society. The family's form changes as it adapts to changing social and economic influences. Until recently,the most common form in North America was the nuclear family,consisting of a married couple with their minor children. The nuclear family is an independent unit. It must be prepared to fend for itself. Individual family members strongly depend on one anoth-er. There is little help from outside the family in emergencies. Elderly relatives of a nuclear family are cared for only if it is possible for the family to do so. In North America,the elderly often do not live with the family;they live in retirement communities and nursing homes.There are many parallels between the nuclear family in industrial societies,such as North America,and of families in societies such as that of the Inuits,who live in harsh environments. The nuclear family structure is well adapted to a life of mobility. In harsh condi-tions,mobility allows the family to hunt for food. For North Americans,the hunt for jobs and improved social status also requires mobility.The nuclear family was not always the North American standard. In a more agrarian time,the small nuclear family was usually part of a larger extended family. This might have included grandparents,mother and father,brothers and sisters,uncles,aunts,and cousins. In North America today,there is a dramatic rise in the number of single-parent households. Twice as many households in the United States are headed by divorced,separated,or never-married individuals as are comprised of nuclear families. The structure of the family,not just in North America,but throughout the world,continues to change as it adapts to changing conditions.The information in the first paragraph is presented mainly throughA: listing statistics B: telling a storyC: pointing out similarities D: pointing out differences
共用题干The FamilyThe structure of a family takes different forms around the world and even in the same society. The family's form changes as it adapts to changing social and economic influences. Until recently,the most common form in North America was the nuclear family,consisting of a married couple with their minor children. The nuclear family is an independent unit. It must be prepared to fend for itself. Individual family members strongly depend on one anoth-er. There is little help from outside the family in emergencies. Elderly relatives of a nuclear family are cared for only if it is possible for the family to do so. In North America,the elderly often do not live with the family;they live in retirement communities and nursing homes.There are many parallels between the nuclear family in industrial societies,such as North America,and of families in societies such as that of the Inuits,who live in harsh environments. The nuclear family structure is well adapted to a life of mobility. In harsh condi-tions,mobility allows the family to hunt for food. For North Americans,the hunt for jobs and improved social status also requires mobility.The nuclear family was not always the North American standard. In a more agrarian time,the small nuclear family was usually part of a larger extended family. This might have included grandparents,mother and father,brothers and sisters,uncles,aunts,and cousins. In North America today,there is a dramatic rise in the number of single-parent households. Twice as many households in the United States are headed by divorced,separated,or never-married individuals as are comprised of nuclear families. The structure of the family,not just in North America,but throughout the world,continues to change as it adapts to changing conditions.Another good title for this passage would be______.A: What Makes a Family? B: The Life of the InuitsC: Living With Hardship D: The Failure of the Nuclear Family
共用题干The FamilyThe structure of a family takes different forms around the world and even in the same society.The family's form changes as it adapts to changing social and economic influences.Until recently,the most common form in North America was the nuclear family,consisting of a married couple with their minor children.The nuclear family is an independent unit,It must be prepared to fend for itself.Individual family members strongly depend on one another.There is little help from outside the family in emergencies.Elderly relatives of a nuclear family are cared for only if it is possible for the family to do so.In North America,the elderly often do not live with the family；they live in retirement communities and nursing homes.There are many parallels between the nuclear family in industrial societies,such asNorth America,and of families in societies such as that of the Inuits,who live in harsh environments.The nuclear family structure is well adapted to a life of mobility.In harsh conditions,mobility allows the family to hunt for food.For North Americans,the hunt for jobs and improved social status also requires mobility.The nuclear family was not always the North American standard.In a more agrarian time,the small nuclear family was usually part of a larger extended family.This might have included grandparents,mother and father,brothers and sisters,uncles,aunts,and cousins.In North America today,there is a dramatic rise in the number of single-parent households.Twice as many households in the United States are headed by divorced,separated,or nevermarried individuals as are comprised of nuclear families.The structure of the family,not just in North America,but throughout the world,continues to change as it adapts to changing conditions.The word“mobility” meansA:moneyB:readiness to moveC:organizationD:skill
共用题干The FamilyThe structure of a family takes different forms around the world and even in the same society.The family's form changes as it adapts to changing social and economic influences.Until recently, the most common form in North America was the nuclear family,consisting of a married couple with their minor children.The nuclear family is an independent unit.It must be prepared to fend for itself. Individual family members strongly depend on one another. There is little help from outside the family in emergencies.Elderly relatives of a nuclear family are cared for only if it is possible for the family to do so.In North America,the elderly often do not live with the family;they live in retirement communities and nursing homes.There are many parallels between the nuclear family in industrial societies,such as NorthAmerica,and of families in societies such as that of the Inuits,who live in harsh environments.The nuclear family structure is well adapted to a life of mobility. In harsh conditions,mobility allows the family to hunt for food.For North Americans,the hunt for jobs and improved social status also requires mobility.The nuclear family was not always the North American standard.In a more agrarian time,the small nuclear family was usually part of a larger extended family.This might have included grandparents,mother and father,brothers and sisters,uncles,aunts,and cousins.In North America today,there is a dramatic rise in the number of single-parent households.Twice as many households in the United States are headed by divorced, separated,or never-married individuals as are comprised of nuclear families. The structure of the family,not just in North America,but throughout the world,continues to change as it adapts to changing conditions.According to the passage,which is the definition of a nuclear family?A:.A nuclear family is a married couple with their minor children.B: A nuclear family is a single father with minor children.C: A nuclear family concludes parents,grandparents,and children.D: A nuclear family concludes parents,children,and aunts and uncles.
内联函数的正确定义是（）A、inline int small（）；int small（）{/*……*/}B、int small（）；inline int small（）{/*……*/}C、int inline small（）；int small（）{/*……*/}D、int small（）；int inline small（）{/*……*/}
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.Aof the electromagnetic disturbances observed being the results of nuclear weapons testingBregarding the observed electromagnetic disturbances having been the results of nuclear weapons testingCthat the electromagnetic disturbances observed were the results of nuclear weapons testingDthat nuclear weapons testing resulted in the electromagnetic disturbances having been observedEthat the electromagnetic disturbance observed were resulting from nuclear weapons testing
单选题While some military planners claimed that it would be possible to win a war fought with nuclear weapons, many scientists argued that such a war could not truly be won, because the fallout from nuclear warfare would create a nuclear winter and it also would be rendering the earth uninhabitable.Ait also would be rendering the earth uninhabitableBrendering the earth uninhabitableCmight have uninhabitably rendered the earthDrender the earth uninhabitableEwould also have rendered the earth uninhabitable
单选题In the second paragraph, the author mainly discusses ______. .Athe nuclear accidents in Japan last MarchBnuclear power policies in GermanyCGerman attitude towards nuclear powerDthe safety levels of nuclear power plants in Germany
单选题Which of the following is an appropriate title for this passage?AJapan's Nuclear Crisis Causes Fear in Europe.BThe Chernobyl Disaster Helps Europe Better Understand Nuclear Power Energy.CGerman Governments Supports Nuclear Power Energy.DGermany Has Learnt a Lesson From Japan.
单选题After several nuclear disasters, a _____ has raged over the safety of nuclear energy.AquarrelBsuspicionCverdictDcontroversy
单选题According to Nishida, the current buying decision by Toshiba is a response to ______Afierce competition in nuclear power businessBfailure in other businesses like semiconductors and DVD playersCpopularity of nuclear power around the worldDexpected increase in market demand for nuclear power generation
单选题What does the passage mainly discuss?AThe acquisition of British Nuclear Fuels by Toshiba.BThe acquisition of Westinghouse Electric by Toshiba.CToshiba’s expansion in nuclear power business.DToshiba’s embarking on nuclear power business.
单选题Hiper is being planned ______.Ato compete with NIFBbecause NIF experiment, even successful, would not produce enough energy to run a nuclear fusion plantCto use the same laser technology but on a larger scaleDto demonstrate the feasibility of nuclear fusion