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[单选题]30.信息系统的性能评价指标通常不包括
A可靠性
B安全性
C可扩展性
D可交互性
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14.在学生关系中设定学生“成绩”值在0~100之间，这种约束属于关系模型的
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22. Urban growth, also known as urbanization (城市化)，sped up dramatically with the coming of industrialization some 200 years ago. At that time, large numbers of people moved to cities in search of jobs, mostly in factories. But the most rapid growth has taken place over the past 50 years. While less than one-third of the world’s population lived in cities in 1950, about two thirds of humanity is expected to live in urban areas by 2030.Urban is defined as “that which is characteristic of a city.” But what exactly is a city? In the past, walls may have defined a city. But today’s city boundaries are often unclear. Are suburbs parts of cities? Depending on the boundaries used, Tokyo can have a population of anywhere between 8 and 40 million people.Cities make a lot of sense for humans. People are concentrated in a small space rather than being spread out over a large territory. This allows the government and others to provide more service such as water, electricity, and transportation to a larger number of people. Schools and shops are more easily accessible than in rural areas.Cities have always been at the center of economic growth and technological advances. The promise of jobs and prosperity pulls people to cities. But their rapid growth has also brought with it many negative things: violence, poverty, overcrowding, health problems, and pollution. Many cities in developing countries in particular are growing too rapidly for their own good, with many residents unable to find jobs and forced to live in slums.(10分)22.1 About years ago, people left for cities to find .(2分)A. foodB. clothesC. jobs D. factories
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组织行为学的学科基础有
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顾客购买某种商品100件以下的单价为10元，100件以上的单价为9元，这种折扣属于（）A、现金折扣B、季节折扣C、功能折扣D、数量折扣
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28．中共十七大报告指出，我国社会主义现代化建设新时期最鲜明的特点是
