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13．关系模型必须满足的完整性约束条件是实体完整性和
A
参照完整性
B
元组完整性
C
关系完整性
D
用户定义完整性
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A
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1.
What is the biggest city in the world？ That is， __1__ city has the largest population？ This seems like __2__ question to answer， but actually it isn't. It's actually rather difficult to say which cities __3__ the largest. There are two reasons for this difficulty. First of all， it isn't easy to determine a city's boundaries， that is， where a city ends. Nowadays， nearly all cities have a large __4__ area around them. So when we talk about the population of a city， we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is. The second reason that it is difficult to __5__ the population of different cities is this： it is almost impossible to get __6__ about the population of all cities for the same year. For example， we might get an estimate of New York's population in 1979 an __7__ of Mexico City's population in 1981. So we really can't compare the numbers because the information is for __8__ different years. the population of cities changes rather quickly， especially in some cases. For example， the population of Beijing， China may increase by 5% each year， so the population figure will change rather quickly. So we can say that these are our two __9__ for comparing the populations of cities： one， it's difficult to determine the __10__ of a city， two， it is difficult to get accurate information. 1. A. what B. which C. where D. how
2.
下列各情况中，不影响会计师事务所和注册会计师独立性的是( )
3.
90. 对各项政策方案效果进行预测性分析和比较，这项工作属于（ ）（2分）
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