density（　　）。

不属于流体Density密度属性类型的是()。 The importance of wood density in wood physical<br>properties belongs to（） Adrenal adenomas show low density in CT images mainly due to its containing Metals in general have high electrical conductivity, high thermal conductivity, and high density. 在计算机配载系统中，输入指令：LFFD://航班号/日期/航站中，DENSITY表示（） 中国大学MOOC: Which statement best describes the task of “density estimation” in machine learning?哪一个是机器学习中“密度估计”任务的准确描述？ A male， age 9， was found with abnormal shadow in the chest by chest X-ray on school physical checkup. Anteroposterior and lateral film reveals a 4cm X 4cm shadow of even density in the back of the right chest. The patients recalled that the patient had coughed occasionally for nearly 1 month. The most likely diagnosis is A 70-year-old woman has nausea， vom iting， abdominal distention， and episodic，crampy midabdominal pain. She has no history of previous surgery but has a long history of cholelithiasis fo r w hich she has refused surgery. H er abdominal radiograph reveals aspherical density in the right low er quadrant. Correct treatm ent should consist of 请阅读Passage 2，完成此题。Passage 2Until a decade or two ago, the centers of many Western cities were emptying while their edges were spreading. This was not for the reasons normally cited. Neither the car nor the motorway caused suburban sprawl, although they sped it up: cities were spreading before either came along.Nor was the flight to the suburbs caused by racism. Whites fled inner-city neighborhoods that were becoming black, but they also fled ones that were not. Planning and zoning rules encouraged sprawl, as did tax breaks for home ownership--but cities spread regardless of these. The real cause was mass affluence. As people grew richer, they demanded more privacy and space. Only a few could afford that in city centers; the rest moved out.The same process is now occurring in the developing world, but much more quickly. The pop-ulation density of metropolitan Beijing has collapsed since 1970, falling from 425 people per hectare to 65. Indian cities are following; Brazil"s are ahead. And suburbanization has a long way to run. Beijing is now about as crowded as metropolitan Chicago was at its most closely packed, in the 1920s. Since then Chicago"s density has fallen by almost three-quarters.This is welcome. Romantic notions of sociable, high-density living--notions pushed, for the most part, by people who themselves occupy rather spacious residences--ignore the squalor and lack of privacy to be found in Kinshasa, Mumbai or the other crowded cities of the poor world.Many of them are far too dense for dignified living, and need to spread out.The Western suburbs to which so many aspire are healthier than their detractors say. The modern Stepfords are no longer white monocultures, but that is progress. For every Ferguson there are many American suburbs that have quietly become black, Hispanic or Asian, or a blend of every-one. Picaresque accounts of decay overlook the fact that America"s suburbs are half as criminal and a 请阅读Passage 2，完成此题。Passage 2Until a decade or two ago, the centers of many Western cities were emptying while their edges were spreading. This was not for the reasons normally cited. Neither the car nor the motorway caused suburban sprawl, although they sped it up: cities were spreading before either came along.Nor was the flight to the suburbs caused by racism. Whites fled inner-city neighborhoods that were becoming black, but they also fled ones that were not. Planning and zoning rules encouraged sprawl, as did tax breaks for home ownership--but cities spread regardless of these. The real cause was mass affluence. As people grew richer, they demanded more privacy and space. Only a few could afford that in city centers; the rest moved out.The same process is now occurring in the developing world, but much more quickly. The pop-ulation density of metropolitan Beijing has collapsed since 1970, falling from 425 people per hectare to 65. Indian cities are following; Brazil"s are ahead. And suburbanization has a long way to run. Beijing is now about as crowded as metropolitan Chicago was at its most closely packed, in the 1920s. Since then Chicago"s density has fallen by almost three-quarters.This is welcome. Romantic notions of sociable, high-density living--notions pushed, for the most part, by people who themselves occupy rather spacious residences--ignore the squalor and lack of privacy to be found in Kinshasa, Mumbai or the other crowded cities of the poor world.Many of them are far too dense for dignified living, and need to spread out.The Western suburbs to which so many aspire are healthier than their detractors say. The modern Stepfords are no longer white monocultures, but that is progress. For every Ferguson there are many American suburbs that have quietly become black, Hispanic or Asian, or a blend of every-one. Picaresque accounts of decay overlook the fact that America"s suburbs are half as criminal and a 请阅读Passage 2，完成此题。Passage 2Until a decade or two ago, the centers of many Western cities were emptying while their edges were spreading. This was not for the reasons normally cited. Neither the car nor the motorway caused suburban sprawl, although they sped it up: cities were spreading before either came along.Nor was the flight to the suburbs caused by racism. Whites fled inner-city neighborhoods that were becoming black, but they also fled ones that were not. Planning and zoning rules encouraged sprawl, as did tax breaks for home ownership--but cities spread regardless of these. The real cause was mass affluence. As people grew richer, they demanded more privacy and space. Only a few could afford that in city centers; the rest moved out.The same process is now occurring in the developing world, but much more quickly. The pop-ulation density of metropolitan Beijing has collapsed since 1970, falling from 425 people per hectare to 65. Indian cities are following; Brazil"s are ahead. And suburbanization has a long way to run. Beijing is now about as crowded as metropolitan Chicago was at its most closely packed, in the 1920s. Since then Chicago"s density has fallen by almost three-quarters.This is welcome. Romantic notions of sociable, high-density living--notions pushed, for the most part, by people who themselves occupy rather spacious residences--ignore the squalor and lack of privacy to be found in Kinshasa, Mumbai or the other crowded cities of the poor world.Many of them are far too dense for dignified living, and need to spread out.The Western suburbs to which so many aspire are healthier than their detractors say. The modern Stepfords are no longer white monocultures, but that is progress. For every Ferguson there are many American suburbs that have quietly become black, Hispanic or Asian, or a blend of every-one. Picaresque accounts of decay overlook the fact that America"s suburbs are half as criminal and a 请阅读Passage 2，完成此题。Passage 2Until a decade or two ago, the centers of many Western cities were emptying while their edges were spreading. This was not for the reasons normally cited. Neither the car nor the motorway caused suburban sprawl, although they sped it up: cities were spreading before either came along.Nor was the flight to the suburbs caused by racism. Whites fled inner-city neighborhoods that were becoming black, but they also fled ones that were not. Planning and zoning rules encouraged sprawl, as did tax breaks for home ownership--but cities spread regardless of these. The real cause was mass affluence. As people grew richer, they demanded more privacy and space. Only a few could afford that in city centers; the rest moved out.The same process is now occurring in the developing world, but much more quickly. The pop-ulation density of metropolitan Beijing has collapsed since 1970, falling from 425 people per hectare to 65. Indian cities are following; Brazil"s are ahead. And suburbanization has a long way to run. Beijing is now about as crowded as metropolitan Chicago was at its most closely packed, in the 1920s. Since then Chicago"s density has fallen by almost three-quarters.This is welcome. Romantic notions of sociable, high-density living--notions pushed, for the most part, by people who themselves occupy rather spacious residences--ignore the squalor and lack of privacy to be found in Kinshasa, Mumbai or the other crowded cities of the poor world.Many of them are far too dense for dignified living, and need to spread out.The Western suburbs to which so many aspire are healthier than their detractors say. The modern Stepfords are no longer white monocultures, but that is progress. For every Ferguson there are many American suburbs that have quietly become black, Hispanic or Asian, or a blend of every-one. Picaresque accounts of decay overlook the fact that America"s suburbs are half as criminal and a 请阅读Passage 2，完成此题。Passage 2Until a decade or two ago, the centers of many Western cities were emptying while their edges were spreading. This was not for the reasons normally cited. Neither the car nor the motorway caused suburban sprawl, although they sped it up: cities were spreading before either came along.Nor was the flight to the suburbs caused by racism. Whites fled inner-city neighborhoods that were becoming black, but they also fled ones that were not. Planning and zoning rules encouraged sprawl, as did tax breaks for home ownership--but cities spread regardless of these. The real cause was mass affluence. As people grew richer, they demanded more privacy and space. Only a few could afford that in city centers; the rest moved out.The same process is now occurring in the developing world, but much more quickly. The pop-ulation density of metropolitan Beijing has collapsed since 1970, falling from 425 people per hectare to 65. Indian cities are following; Brazil"s are ahead. And suburbanization has a long way to run. Beijing is now about as crowded as metropolitan Chicago was at its most closely packed, in the 1920s. Since then Chicago"s density has fallen by almost three-quarters.This is welcome. Romantic notions of sociable, high-density living--notions pushed, for the most part, by people who themselves occupy rather spacious residences--ignore the squalor and lack of privacy to be found in Kinshasa, Mumbai or the other crowded cities of the poor world.Many of them are far too dense for dignified living, and need to spread out.The Western suburbs to which so many aspire are healthier than their detractors say. The modern Stepfords are no longer white monocultures, but that is progress. For every Ferguson there are many American suburbs that have quietly become black, Hispanic or Asian, or a blend of every-one. Picaresque accounts of decay overlook the fact that America"s suburbs are half as criminal and a Practice 1　　Britain (or Great Britain) is an island that lies off the north-west coast of Europe. The nearest country is France, which is 20 miles away and from which Britain is separated by the English Channel. The island is surrounded by the Atlantic Ocean to the west, and the North Sea to the east. 1______ Scotland is in the north, while Wales is in the west. Ireland, which is also an island, lies off the west coast of Britain. It consists of Northern Ireland and the Irish Republic. Britain together with Northern Ireland constitute the United Kingdom (UK). Thus, the United Kingdom is composed of four countries, the largest of which is England. The capital city is London, which is situated in south-east England.　　2______ About 70% of the land area is devoted to agriculture, about 7% is wasteland, moorland and mountains, about 13% is devoted to urban development, and 10% is forest and woodland. The northern and western regions of Britain, that is Scotland and Wales, are mainly mountainous and hilly. 3______　　Britain has a generally mild and temperate climate. It is, however, subject to frequent changes. It has an average annual rainfall of about 120 centimetres (47 inches).　　4______ The density of population was approximately 240 people per square kilometre. However, in England, where 83% of the population live, the density was much higher, about 363 per square kilometre.　　5______ However, in western Wales, Welsh is the first language for many of the people. In Scotland only a small number of people speak Gaelic.　　In Britain about 66% of the population say that they are Christian, while fewer than 5% say that they belong to other religions.[A] The UK has a total area of about 244,100 square kilometres (94,248 square miles).[B] In the UK, English is the first language of the vast majority of people.[C] It comprises the mainlands of England, Wales and Scotland, that is, three countries.[D] The U. K. is a cou 资料：Happy wood sprites knows the way to Fenghuang city.Happy wood sprites will hold a big party along the Spirit Lake tonightThe Spirit Lake is located in North-east of hereThe density of tree branches and leaves could tell direction. Generally ,the direction that has More branches and leaves is the south.According to astrology,you could determine direction. Firstly, you should find the adle Big Dipper. In the direction of the handle you can find Poiaris and that direction is the north.打开信封，里面是一个请柬A recital of poems by Barbie Mariposa that retelllegends from the tribal culture of the Spirit Lake.Accompaniment by Happy wood sprites who will beplaying harp native spirit Lake instruments fromhis private collectionGreen spinach salad with vinaigrette dressingCream of mushroom soupGrilled salmon with choice of either roasted squashor steamed broccoliLemon meringue tartDinner will start promptly at midnight and endbefore sunrise is Tree House of Spirit Lake .Formal Dressing requires. How is the fish prepared? 资料：Happy wood sprites knows the way to Fenghuang city.Happy wood sprites will hold a big party along the Spirit Lake tonightThe Spirit Lake is located in North-east of hereThe density of tree branches and leaves could tell direction. Generally ,the direction that has More branches and leaves is the south.According to astrology,you could determine direction. Firstly, you should find the adle Big Dipper. In the direction of the handle you can find Poiaris and that direction is the north.打开信封，里面是一个请柬A recital of poems by Barbie Mariposa that retelllegends from the tribal culture of the Spirit Lake.Accompaniment by Happy wood sprites who will beplaying harp native spirit Lake instruments fromhis private collectionGreen spinach salad with vinaigrette dressingCream of mushroom soupGrilled salmon with choice of either roasted squashor steamed broccoliLemon meringue tartDinner will start promptly at midnight and endbefore sunrise is Tree House of Spirit Lake .Formal Dressing requires.What will Happy wood sprites contribute to the event? 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）.If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found,however,so black holes remain one of the mysteries of the universe. 共用题干 Black HolesMost scientists agree that black holes exist but are nearly impossible to locate.A black hole in the universe is not a solid object,like a planet,but it is shaped like a sphere（球体）. Astronomers（天文学家）think that at the center of a black hole there is a single point in space with infinite（无限的）density（稠密）.This single point is called a singularity（奇点）. If the singularity theory is correct,it means that when a massive star collapses,all the material in it disappears into the singularity.The center of a black hole would not really be a hole at all,but an infinitely dense point.Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist,they are difficult to observe.These are the reasons.No light or anything else comes out of black holes.As a result,they are invisible to a telescope.In astronomical terms,black holes are truly tiny.For example,a black hole formed by the collapse of a giant star would have an event horizon（视界）only 18 miles across.The nearest black holes would be dozens of light years away from Earth.One light year is about 6 trillion（万亿）miles. Even the most powerlul telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist.There are still answers to be found,however,so black holes remain one of the mysteries of the universe. Passage 3Fermented Foods for Babies　　Malnutrition during weaning age-when breast milk is being replaced by semi-solid foods-is highly prevalent in children of poor households in many developing countries. While the etiology is complex and multifactorial, the immediate causes are recognized as feeding at less than adequate levels for children’s growth and development, and recurrent infections, including diarrhea, resulting mainly from ingestion of contaminated foods. As a result, many young children, particularly between six months to two years of age, experience weight loss and impaired growth and development.　　Studies by investigators in various countries have concentrated on traditional food preparation methods and have resulted in offering cheap and practical answers to these problems based on familiar, indigenous and culturally acceptable home processing practices.　　Two such answers have arisen. Firstly, cereal fermentation is used for reducing the risk of contamination under the existing inappropriate conditions for food preparation and storage in many households. Secondly, a tiny amount of sprouted grains flour is used in preparation of weaning foods as a magic way to lessen the viscosity without decreasing energy density. 　　A method to eliminate pathogenic bacteria and inhibit their growth during storage of weaning preparations can benefit nutrition and health in young children considerably. Use of fermented foods for feeding children of weaning age appears to be an effective solution. Fermented foods have lower levels of diarrhoeal germ contamination, they are suitable for child feeding, and can be safely stored for much longer periods of time than fresh foods.　　The practice has been a traditional way of food preservation in many parts of the world. The anti-microbial properties of fermented foods and their relative higher safety-documented since the early 1900’s-have been in If English means endless new words，difficult grammar and sometimes strange pronunciation，you are wrong.Haven’t you noticed that you have become smarter since you started to learn a language?According to a new study by a British university，learning a second language can lead to an increase in your brain power，Researchers found that learning other languages changes grey matter.This is the area of the brain which processes information.It is similar to the way that exercise builds muscles.The study also found the effect is greater，the younger people learn a second language.A team led by Dr Andrea Mechelli，from University College London，took a group of Britons who only spoke English.They were compared with a group of“early bilinguals”who had learnt a second language before the age of five，as well as a number of later learners.Scans showed that grey matter density（密度）in the brain was greater in bilinguals than in people without a second language.But the longer a person waited before mastering a new language，the smaller the difference.“Our findings suggest that the structure of the brain is changed by the experience of learning a second language，”said the scientists.It means that the change itself increases the ability to learn.Professor Dylan Vaughan Jones of the University of Wales has researched the link between bilingualism and maths skills.“Having two languages gives you two windows on the world and makes the brain more flexible，”he said.“You are actually going beyond language and have a better understanding of different ideas.”The findings were matched in a study of native Italian speakers who had learned English as a second language between the ages of 2 and 34.Reading，writing，and comprehension were all tested.The results showed，that the younger they started to learn，the better.“Studying a language means you get an entrance to another world，”explained the scientists.We may know from the scientific findings that（　　）.