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JPEG图像编码标准可以支持（）格式，其有损编码的核心算法是（），无损编码的核心算法是（）。我们在图像处理软件中将图像另存为JPEG格式时，通常可以选择图像的重构质量，这是通过（）环节进行调节的。 JPEG图像编码标准无损编码的核心算法是（）。
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Many theories concerning the causes of juvenile delinquency crimes committed by young people focus either on the individual or on society as the major contributing influence. Theories 16 on the individual suggest that children engage in criminal behavior 17 they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through 18 with others. Theories focusing on the role of society suggest that children commit crimes in 19 to their failure to rise above their socioeconomic status 20 as a rejection of middleclass values. Most theories of juvenile delinquency have focused on children from disadvantaged families, 21 the fact that children from wealthy homes also commit crimes. The latter may commit crimes 22 lack of adequate parental control. All theories, however, are tentative and are 23 to criticism. Changes in the social structure may indirectly 24 juvenile crime rates. For example, changes in the economy that 25 to fewer job opportunities for youth and rising unemployment 26 make gainful employment increasingly difficult to obtain. The resulting discontent may in 27 lead more youths into criminal behavior. Families have also 28 changes these years. More families consist of oneparent households or two working parents; 29, children are likely to have less supervision at home, 30 was common in the traditional family 31. This lack of parental supervision is thought to be an influence on juvenile crime rates. Other 32 causes of offensive acts include frustration or failure in school, the increased 33 of drugs and alcohol, and the growing 34 of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act, 35 a direct causal relationship has not yet been established.
Many theories concerning the causes of juvenile delinquency crimes committed by young people focus either on the individual or on society as the major contributing influence. Theories 16 on the individual suggest that children engage in criminal behavior 17 they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through 18 with others. Theories focusing on the role of society suggest that children commit crimes in 19 to their failure to rise above their socioeconomic status 20 as a rejection of middleclass values. Most theories of juvenile delinquency have focused on children from disadvantaged families, 21 the fact that children from wealthy homes also commit crimes. The latter may commit crimes 22 lack of adequate parental control. All theories, however, are tentative and are 23 to criticism. Changes in the social structure may indirectly 24 juvenile crime rates. For example, changes in the economy that 25 to fewer job opportunities for youth and rising unemployment 26 make gainful employment increasingly difficult to obtain. The resulting discontent may in 27 lead more youths into criminal behavior. Families have also 28 changes these years. More families consist of oneparent households or two working parents; 29, children are likely to have less supervision at home, 30 was common in the traditional family 31. This lack of parental supervision is thought to be an influence on juvenile crime rates. Other 32 causes of offensive acts include frustration or failure in school, the increased 33 of drugs and alcohol, and the growing 34 of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act, 35 a direct causal relationship has not yet been established.
A A volcanic eruption in Iceland has sent ash across northern Europe.Airlines have stopped or changed the flights across the Atlantic Ocean,leaving hundreds of passengers stuck in airports. Grimsvotn is one of the largest active volcanoes in Europe.What makes Grimsvotn different is that it lies under a huge glacier（冰川） of ice up to 12 meters thick.The hot volcano heats up the ice above it,which then forms a layer（层） of water between the glacier and the volcano.This layer of water puts pressure on the volcano,keeping it stable.As the water flows out from under the glacier,the pressure lifts.The lava（岩浆） from the volcano then comes up to the surface.This is exactly what has happened today. Now,airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash.According to KLM,one of Europes biggest airlines,airplanes cannot go under the cloud or over it.Going through the cloud can result in ash getting stuck in the airplanes engines,causing damage to the plane. The eruption has also caused problems for animals in Iceland.The volcano left ash and sharp,glasslike rocks all over the countryside.Farmers are keeping their animals inside to stop them from eating ashcovered grass or the sharp objects. What keeps Grimsvotn still
H.261的视频图像序列有（）种，MPEG-1的视频图像序列增加了（）。 H.261的视频图像序列有（）种。
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